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   1  # Jooa11y - Joomla Accessibility Checker - License

   2  Copyright (c) 2021 Open Source Matters, Inc.
   3  
   4  ## GNU General Public License

   5  
   6                      GNU GENERAL PUBLIC LICENSE
   7                         Version 2, June 1991
   8  
   9   Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
  10   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  11   Everyone is permitted to copy and distribute verbatim copies
  12   of this license document, but changing it is not allowed.
  13  
  14                              Preamble
  15  
  16    The licenses for most software are designed to take away your
  17  freedom to share and change it.  By contrast, the GNU General Public
  18  License is intended to guarantee your freedom to share and change free
  19  software--to make sure the software is free for all its users.  This
  20  General Public License applies to most of the Free Software
  21  Foundation's software and to any other program whose authors commit to
  22  using it.  (Some other Free Software Foundation software is covered by
  23  the GNU Lesser General Public License instead.)  You can apply it to
  24  your programs, too.
  25  
  26    When we speak of free software, we are referring to freedom, not
  27  price.  Our General Public Licenses are designed to make sure that you
  28  have the freedom to distribute copies of free software (and charge for
  29  this service if you wish), that you receive source code or can get it
  30  if you want it, that you can change the software or use pieces of it
  31  in new free programs; and that you know you can do these things.
  32  
  33    To protect your rights, we need to make restrictions that forbid
  34  anyone to deny you these rights or to ask you to surrender the rights.
  35  These restrictions translate to certain responsibilities for you if you
  36  distribute copies of the software, or if you modify it.
  37  
  38    For example, if you distribute copies of such a program, whether
  39  gratis or for a fee, you must give the recipients all the rights that
  40  you have.  You must make sure that they, too, receive or can get the
  41  source code.  And you must show them these terms so they know their
  42  rights.
  43  
  44    We protect your rights with two steps: (1) copyright the software, and
  45  (2) offer you this license which gives you legal permission to copy,
  46  distribute and/or modify the software.
  47  
  48    Also, for each author's protection and ours, we want to make certain
  49  that everyone understands that there is no warranty for this free
  50  software.  If the software is modified by someone else and passed on, we
  51  want its recipients to know that what they have is not the original, so
  52  that any problems introduced by others will not reflect on the original
  53  authors' reputations.
  54  
  55    Finally, any free program is threatened constantly by software
  56  patents.  We wish to avoid the danger that redistributors of a free
  57  program will individually obtain patent licenses, in effect making the
  58  program proprietary.  To prevent this, we have made it clear that any
  59  patent must be licensed for everyone's free use or not licensed at all.
  60  
  61    The precise terms and conditions for copying, distribution and
  62  modification follow.
  63  
  64                      GNU GENERAL PUBLIC LICENSE
  65     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  66  
  67    0. This License applies to any program or other work which contains
  68  a notice placed by the copyright holder saying it may be distributed
  69  under the terms of this General Public License.  The "Program", below,
  70  refers to any such program or work, and a "work based on the Program"
  71  means either the Program or any derivative work under copyright law:
  72  that is to say, a work containing the Program or a portion of it,
  73  either verbatim or with modifications and/or translated into another
  74  language.  (Hereinafter, translation is included without limitation in
  75  the term "modification".)  Each licensee is addressed as "you".
  76  
  77  Activities other than copying, distribution and modification are not
  78  covered by this License; they are outside its scope.  The act of
  79  running the Program is not restricted, and the output from the Program
  80  is covered only if its contents constitute a work based on the
  81  Program (independent of having been made by running the Program).
  82  Whether that is true depends on what the Program does.
  83  
  84    1. You may copy and distribute verbatim copies of the Program's
  85  source code as you receive it, in any medium, provided that you
  86  conspicuously and appropriately publish on each copy an appropriate
  87  copyright notice and disclaimer of warranty; keep intact all the
  88  notices that refer to this License and to the absence of any warranty;
  89  and give any other recipients of the Program a copy of this License
  90  along with the Program.
  91  
  92  You may charge a fee for the physical act of transferring a copy, and
  93  you may at your option offer warranty protection in exchange for a fee.
  94  
  95    2. You may modify your copy or copies of the Program or any portion
  96  of it, thus forming a work based on the Program, and copy and
  97  distribute such modifications or work under the terms of Section 1
  98  above, provided that you also meet all of these conditions:
  99  
 100      a) You must cause the modified files to carry prominent notices
 101      stating that you changed the files and the date of any change.
 102  
 103      b) You must cause any work that you distribute or publish, that in
 104      whole or in part contains or is derived from the Program or any
 105      part thereof, to be licensed as a whole at no charge to all third
 106      parties under the terms of this License.
 107  
 108      c) If the modified program normally reads commands interactively
 109      when run, you must cause it, when started running for such
 110      interactive use in the most ordinary way, to print or display an
 111      announcement including an appropriate copyright notice and a
 112      notice that there is no warranty (or else, saying that you provide
 113      a warranty) and that users may redistribute the program under
 114      these conditions, and telling the user how to view a copy of this
 115      License.  (Exception: if the Program itself is interactive but
 116      does not normally print such an announcement, your work based on
 117      the Program is not required to print an announcement.)
 118  
 119  These requirements apply to the modified work as a whole.  If
 120  identifiable sections of that work are not derived from the Program,
 121  and can be reasonably considered independent and separate works in
 122  themselves, then this License, and its terms, do not apply to those
 123  sections when you distribute them as separate works.  But when you
 124  distribute the same sections as part of a whole which is a work based
 125  on the Program, the distribution of the whole must be on the terms of
 126  this License, whose permissions for other licensees extend to the
 127  entire whole, and thus to each and every part regardless of who wrote it.
 128  
 129  Thus, it is not the intent of this section to claim rights or contest
 130  your rights to work written entirely by you; rather, the intent is to
 131  exercise the right to control the distribution of derivative or
 132  collective works based on the Program.
 133  
 134  In addition, mere aggregation of another work not based on the Program
 135  with the Program (or with a work based on the Program) on a volume of
 136  a storage or distribution medium does not bring the other work under
 137  the scope of this License.
 138  
 139    3. You may copy and distribute the Program (or a work based on it,
 140  under Section 2) in object code or executable form under the terms of
 141  Sections 1 and 2 above provided that you also do one of the following:
 142  
 143      a) Accompany it with the complete corresponding machine-readable
 144      source code, which must be distributed under the terms of Sections
 145      1 and 2 above on a medium customarily used for software interchange; or,
 146  
 147      b) Accompany it with a written offer, valid for at least three
 148      years, to give any third party, for a charge no more than your
 149      cost of physically performing source distribution, a complete
 150      machine-readable copy of the corresponding source code, to be
 151      distributed under the terms of Sections 1 and 2 above on a medium
 152      customarily used for software interchange; or,
 153  
 154      c) Accompany it with the information you received as to the offer
 155      to distribute corresponding source code.  (This alternative is
 156      allowed only for noncommercial distribution and only if you
 157      received the program in object code or executable form with such
 158      an offer, in accord with Subsection b above.)
 159  
 160  The source code for a work means the preferred form of the work for
 161  making modifications to it.  For an executable work, complete source
 162  code means all the source code for all modules it contains, plus any
 163  associated interface definition files, plus the scripts used to
 164  control compilation and installation of the executable.  However, as a
 165  special exception, the source code distributed need not include
 166  anything that is normally distributed (in either source or binary
 167  form) with the major components (compiler, kernel, and so on) of the
 168  operating system on which the executable runs, unless that component
 169  itself accompanies the executable.
 170  
 171  If distribution of executable or object code is made by offering
 172  access to copy from a designated place, then offering equivalent
 173  access to copy the source code from the same place counts as
 174  distribution of the source code, even though third parties are not
 175  compelled to copy the source along with the object code.
 176  
 177    4. You may not copy, modify, sublicense, or distribute the Program
 178  except as expressly provided under this License.  Any attempt
 179  otherwise to copy, modify, sublicense or distribute the Program is
 180  void, and will automatically terminate your rights under this License.
 181  However, parties who have received copies, or rights, from you under
 182  this License will not have their licenses terminated so long as such
 183  parties remain in full compliance.
 184  
 185    5. You are not required to accept this License, since you have not
 186  signed it.  However, nothing else grants you permission to modify or
 187  distribute the Program or its derivative works.  These actions are
 188  prohibited by law if you do not accept this License.  Therefore, by
 189  modifying or distributing the Program (or any work based on the
 190  Program), you indicate your acceptance of this License to do so, and
 191  all its terms and conditions for copying, distributing or modifying
 192  the Program or works based on it.
 193  
 194    6. Each time you redistribute the Program (or any work based on the
 195  Program), the recipient automatically receives a license from the
 196  original licensor to copy, distribute or modify the Program subject to
 197  these terms and conditions.  You may not impose any further
 198  restrictions on the recipients' exercise of the rights granted herein.
 199  You are not responsible for enforcing compliance by third parties to
 200  this License.
 201  
 202    7. If, as a consequence of a court judgment or allegation of patent
 203  infringement or for any other reason (not limited to patent issues),
 204  conditions are imposed on you (whether by court order, agreement or
 205  otherwise) that contradict the conditions of this License, they do not
 206  excuse you from the conditions of this License.  If you cannot
 207  distribute so as to satisfy simultaneously your obligations under this
 208  License and any other pertinent obligations, then as a consequence you
 209  may not distribute the Program at all.  For example, if a patent
 210  license would not permit royalty-free redistribution of the Program by
 211  all those who receive copies directly or indirectly through you, then
 212  the only way you could satisfy both it and this License would be to
 213  refrain entirely from distribution of the Program.
 214  
 215  If any portion of this section is held invalid or unenforceable under
 216  any particular circumstance, the balance of the section is intended to
 217  apply and the section as a whole is intended to apply in other
 218  circumstances.
 219  
 220  It is not the purpose of this section to induce you to infringe any
 221  patents or other property right claims or to contest validity of any
 222  such claims; this section has the sole purpose of protecting the
 223  integrity of the free software distribution system, which is
 224  implemented by public license practices.  Many people have made
 225  generous contributions to the wide range of software distributed
 226  through that system in reliance on consistent application of that
 227  system; it is up to the author/donor to decide if he or she is willing
 228  to distribute software through any other system and a licensee cannot
 229  impose that choice.
 230  
 231  This section is intended to make thoroughly clear what is believed to
 232  be a consequence of the rest of this License.
 233  
 234    8. If the distribution and/or use of the Program is restricted in
 235  certain countries either by patents or by copyrighted interfaces, the
 236  original copyright holder who places the Program under this License
 237  may add an explicit geographical distribution limitation excluding
 238  those countries, so that distribution is permitted only in or among
 239  countries not thus excluded.  In such case, this License incorporates
 240  the limitation as if written in the body of this License.
 241  
 242    9. The Free Software Foundation may publish revised and/or new versions
 243  of the General Public License from time to time.  Such new versions will
 244  be similar in spirit to the present version, but may differ in detail to
 245  address new problems or concerns.
 246  
 247  Each version is given a distinguishing version number.  If the Program
 248  specifies a version number of this License which applies to it and "any
 249  later version", you have the option of following the terms and conditions
 250  either of that version or of any later version published by the Free
 251  Software Foundation.  If the Program does not specify a version number of
 252  this License, you may choose any version ever published by the Free Software
 253  Foundation.
 254  
 255    10. If you wish to incorporate parts of the Program into other free
 256  programs whose distribution conditions are different, write to the author
 257  to ask for permission.  For software which is copyrighted by the Free
 258  Software Foundation, write to the Free Software Foundation; we sometimes
 259  make exceptions for this.  Our decision will be guided by the two goals
 260  of preserving the free status of all derivatives of our free software and
 261  of promoting the sharing and reuse of software generally.
 262  
 263                              NO WARRANTY
 264  
 265    11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 266  FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 267  OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 268  PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 269  OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 270  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 271  TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 272  PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 273  REPAIR OR CORRECTION.
 274  
 275    12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 276  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 277  REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 278  INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 279  OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 280  TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 281  YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 282  PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 283  POSSIBILITY OF SUCH DAMAGES.
 284  
 285                       END OF TERMS AND CONDITIONS
 286  
 287              How to Apply These Terms to Your New Programs
 288  
 289    If you develop a new program, and you want it to be of the greatest
 290  possible use to the public, the best way to achieve this is to make it
 291  free software which everyone can redistribute and change under these terms.
 292  
 293    To do so, attach the following notices to the program.  It is safest
 294  to attach them to the start of each source file to most effectively
 295  convey the exclusion of warranty; and each file should have at least
 296  the "copyright" line and a pointer to where the full notice is found.
 297  
 298      <one line to give the program's name and a brief idea of what it does.>
 299      Copyright (C) <year>  <name of author>
 300  
 301      This program is free software; you can redistribute it and/or modify
 302      it under the terms of the GNU General Public License as published by
 303      the Free Software Foundation; either version 2 of the License, or
 304      (at your option) any later version.
 305  
 306      This program is distributed in the hope that it will be useful,
 307      but WITHOUT ANY WARRANTY; without even the implied warranty of
 308      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 309      GNU General Public License for more details.
 310  
 311      You should have received a copy of the GNU General Public License along
 312      with this program; if not, write to the Free Software Foundation, Inc.,
 313      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 314  
 315  Also add information on how to contact you by electronic and paper mail.
 316  
 317  If the program is interactive, make it output a short notice like this
 318  when it starts in an interactive mode:
 319  
 320      Gnomovision version 69, Copyright (C) year name of author
 321      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
 322      This is free software, and you are welcome to redistribute it
 323      under certain conditions; type `show c' for details.
 324  
 325  The hypothetical commands `show w' and `show c' should show the appropriate
 326  parts of the General Public License.  Of course, the commands you use may
 327  be called something other than `show w' and `show c'; they could even be
 328  mouse-clicks or menu items--whatever suits your program.
 329  
 330  You should also get your employer (if you work as a programmer) or your
 331  school, if any, to sign a "copyright disclaimer" for the program, if
 332  necessary.  Here is a sample; alter the names:
 333  
 334    Yoyodyne, Inc., hereby disclaims all copyright interest in the program
 335    `Gnomovision' (which makes passes at compilers) written by James Hacker.
 336  
 337    <signature of Ty Coon>, 1 April 1989
 338    Ty Coon, President of Vice
 339  
 340  This General Public License does not permit incorporating your program into
 341  proprietary programs.  If your program is a subroutine library, you may
 342  consider it more useful to permit linking proprietary applications with the
 343  library.  If this is what you want to do, use the GNU Lesser General
 344  Public License instead of this License.
 345  
 346  ## Sa11y by Ryerson University

 347  Various parts of Jooa11y is adapted from [Sa11y by Ryerson University](https://github.com/ryersondmp/sa11y)
 348  
 349  # Sa11y - License

 350  
 351  The development of Sa11y is led by Adam Chaboryk, IT Accessibility Specialist, Digital Media Projects, Computing and Communication Services (CCS) at Ryerson University in Toronto, Canada. Sa11y is released under the GNU GPL v2.0 license. Previous versions of Sa11y (v2.0 and below) were released under the MIT license.
 352  
 353  Copyright (c) 2020 - 2022. Ryerson University.
 354  
 355  ## GNU General Public License

 356  
 357                      GNU GENERAL PUBLIC LICENSE
 358                         Version 2, June 1991
 359  
 360   Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 361   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 362   Everyone is permitted to copy and distribute verbatim copies
 363   of this license document, but changing it is not allowed.
 364  
 365                              Preamble
 366  
 367    The licenses for most software are designed to take away your
 368  freedom to share and change it.  By contrast, the GNU General Public
 369  License is intended to guarantee your freedom to share and change free
 370  software--to make sure the software is free for all its users.  This
 371  General Public License applies to most of the Free Software
 372  Foundation's software and to any other program whose authors commit to
 373  using it.  (Some other Free Software Foundation software is covered by
 374  the GNU Lesser General Public License instead.)  You can apply it to
 375  your programs, too.
 376  
 377    When we speak of free software, we are referring to freedom, not
 378  price.  Our General Public Licenses are designed to make sure that you
 379  have the freedom to distribute copies of free software (and charge for
 380  this service if you wish), that you receive source code or can get it
 381  if you want it, that you can change the software or use pieces of it
 382  in new free programs; and that you know you can do these things.
 383  
 384    To protect your rights, we need to make restrictions that forbid
 385  anyone to deny you these rights or to ask you to surrender the rights.
 386  These restrictions translate to certain responsibilities for you if you
 387  distribute copies of the software, or if you modify it.
 388  
 389    For example, if you distribute copies of such a program, whether
 390  gratis or for a fee, you must give the recipients all the rights that
 391  you have.  You must make sure that they, too, receive or can get the
 392  source code.  And you must show them these terms so they know their
 393  rights.
 394  
 395    We protect your rights with two steps: (1) copyright the software, and
 396  (2) offer you this license which gives you legal permission to copy,
 397  distribute and/or modify the software.
 398  
 399    Also, for each author's protection and ours, we want to make certain
 400  that everyone understands that there is no warranty for this free
 401  software.  If the software is modified by someone else and passed on, we
 402  want its recipients to know that what they have is not the original, so
 403  that any problems introduced by others will not reflect on the original
 404  authors' reputations.
 405  
 406    Finally, any free program is threatened constantly by software
 407  patents.  We wish to avoid the danger that redistributors of a free
 408  program will individually obtain patent licenses, in effect making the
 409  program proprietary.  To prevent this, we have made it clear that any
 410  patent must be licensed for everyone's free use or not licensed at all.
 411  
 412    The precise terms and conditions for copying, distribution and
 413  modification follow.
 414  
 415                      GNU GENERAL PUBLIC LICENSE
 416     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 417  
 418    0. This License applies to any program or other work which contains
 419  a notice placed by the copyright holder saying it may be distributed
 420  under the terms of this General Public License.  The "Program", below,
 421  refers to any such program or work, and a "work based on the Program"
 422  means either the Program or any derivative work under copyright law:
 423  that is to say, a work containing the Program or a portion of it,
 424  either verbatim or with modifications and/or translated into another
 425  language.  (Hereinafter, translation is included without limitation in
 426  the term "modification".)  Each licensee is addressed as "you".
 427  
 428  Activities other than copying, distribution and modification are not
 429  covered by this License; they are outside its scope.  The act of
 430  running the Program is not restricted, and the output from the Program
 431  is covered only if its contents constitute a work based on the
 432  Program (independent of having been made by running the Program).
 433  Whether that is true depends on what the Program does.
 434  
 435    1. You may copy and distribute verbatim copies of the Program's
 436  source code as you receive it, in any medium, provided that you
 437  conspicuously and appropriately publish on each copy an appropriate
 438  copyright notice and disclaimer of warranty; keep intact all the
 439  notices that refer to this License and to the absence of any warranty;
 440  and give any other recipients of the Program a copy of this License
 441  along with the Program.
 442  
 443  You may charge a fee for the physical act of transferring a copy, and
 444  you may at your option offer warranty protection in exchange for a fee.
 445  
 446    2. You may modify your copy or copies of the Program or any portion
 447  of it, thus forming a work based on the Program, and copy and
 448  distribute such modifications or work under the terms of Section 1
 449  above, provided that you also meet all of these conditions:
 450  
 451      a) You must cause the modified files to carry prominent notices
 452      stating that you changed the files and the date of any change.
 453  
 454      b) You must cause any work that you distribute or publish, that in
 455      whole or in part contains or is derived from the Program or any
 456      part thereof, to be licensed as a whole at no charge to all third
 457      parties under the terms of this License.
 458  
 459      c) If the modified program normally reads commands interactively
 460      when run, you must cause it, when started running for such
 461      interactive use in the most ordinary way, to print or display an
 462      announcement including an appropriate copyright notice and a
 463      notice that there is no warranty (or else, saying that you provide
 464      a warranty) and that users may redistribute the program under
 465      these conditions, and telling the user how to view a copy of this
 466      License.  (Exception: if the Program itself is interactive but
 467      does not normally print such an announcement, your work based on
 468      the Program is not required to print an announcement.)
 469  
 470  These requirements apply to the modified work as a whole.  If
 471  identifiable sections of that work are not derived from the Program,
 472  and can be reasonably considered independent and separate works in
 473  themselves, then this License, and its terms, do not apply to those
 474  sections when you distribute them as separate works.  But when you
 475  distribute the same sections as part of a whole which is a work based
 476  on the Program, the distribution of the whole must be on the terms of
 477  this License, whose permissions for other licensees extend to the
 478  entire whole, and thus to each and every part regardless of who wrote it.
 479  
 480  Thus, it is not the intent of this section to claim rights or contest
 481  your rights to work written entirely by you; rather, the intent is to
 482  exercise the right to control the distribution of derivative or
 483  collective works based on the Program.
 484  
 485  In addition, mere aggregation of another work not based on the Program
 486  with the Program (or with a work based on the Program) on a volume of
 487  a storage or distribution medium does not bring the other work under
 488  the scope of this License.
 489  
 490    3. You may copy and distribute the Program (or a work based on it,
 491  under Section 2) in object code or executable form under the terms of
 492  Sections 1 and 2 above provided that you also do one of the following:
 493  
 494      a) Accompany it with the complete corresponding machine-readable
 495      source code, which must be distributed under the terms of Sections
 496      1 and 2 above on a medium customarily used for software interchange; or,
 497  
 498      b) Accompany it with a written offer, valid for at least three
 499      years, to give any third party, for a charge no more than your
 500      cost of physically performing source distribution, a complete
 501      machine-readable copy of the corresponding source code, to be
 502      distributed under the terms of Sections 1 and 2 above on a medium
 503      customarily used for software interchange; or,
 504  
 505      c) Accompany it with the information you received as to the offer
 506      to distribute corresponding source code.  (This alternative is
 507      allowed only for noncommercial distribution and only if you
 508      received the program in object code or executable form with such
 509      an offer, in accord with Subsection b above.)
 510  
 511  The source code for a work means the preferred form of the work for
 512  making modifications to it.  For an executable work, complete source
 513  code means all the source code for all modules it contains, plus any
 514  associated interface definition files, plus the scripts used to
 515  control compilation and installation of the executable.  However, as a
 516  special exception, the source code distributed need not include
 517  anything that is normally distributed (in either source or binary
 518  form) with the major components (compiler, kernel, and so on) of the
 519  operating system on which the executable runs, unless that component
 520  itself accompanies the executable.
 521  
 522  If distribution of executable or object code is made by offering
 523  access to copy from a designated place, then offering equivalent
 524  access to copy the source code from the same place counts as
 525  distribution of the source code, even though third parties are not
 526  compelled to copy the source along with the object code.
 527  
 528    4. You may not copy, modify, sublicense, or distribute the Program
 529  except as expressly provided under this License.  Any attempt
 530  otherwise to copy, modify, sublicense or distribute the Program is
 531  void, and will automatically terminate your rights under this License.
 532  However, parties who have received copies, or rights, from you under
 533  this License will not have their licenses terminated so long as such
 534  parties remain in full compliance.
 535  
 536    5. You are not required to accept this License, since you have not
 537  signed it.  However, nothing else grants you permission to modify or
 538  distribute the Program or its derivative works.  These actions are
 539  prohibited by law if you do not accept this License.  Therefore, by
 540  modifying or distributing the Program (or any work based on the
 541  Program), you indicate your acceptance of this License to do so, and
 542  all its terms and conditions for copying, distributing or modifying
 543  the Program or works based on it.
 544  
 545    6. Each time you redistribute the Program (or any work based on the
 546  Program), the recipient automatically receives a license from the
 547  original licensor to copy, distribute or modify the Program subject to
 548  these terms and conditions.  You may not impose any further
 549  restrictions on the recipients' exercise of the rights granted herein.
 550  You are not responsible for enforcing compliance by third parties to
 551  this License.
 552  
 553    7. If, as a consequence of a court judgment or allegation of patent
 554  infringement or for any other reason (not limited to patent issues),
 555  conditions are imposed on you (whether by court order, agreement or
 556  otherwise) that contradict the conditions of this License, they do not
 557  excuse you from the conditions of this License.  If you cannot
 558  distribute so as to satisfy simultaneously your obligations under this
 559  License and any other pertinent obligations, then as a consequence you
 560  may not distribute the Program at all.  For example, if a patent
 561  license would not permit royalty-free redistribution of the Program by
 562  all those who receive copies directly or indirectly through you, then
 563  the only way you could satisfy both it and this License would be to
 564  refrain entirely from distribution of the Program.
 565  
 566  If any portion of this section is held invalid or unenforceable under
 567  any particular circumstance, the balance of the section is intended to
 568  apply and the section as a whole is intended to apply in other
 569  circumstances.
 570  
 571  It is not the purpose of this section to induce you to infringe any
 572  patents or other property right claims or to contest validity of any
 573  such claims; this section has the sole purpose of protecting the
 574  integrity of the free software distribution system, which is
 575  implemented by public license practices.  Many people have made
 576  generous contributions to the wide range of software distributed
 577  through that system in reliance on consistent application of that
 578  system; it is up to the author/donor to decide if he or she is willing
 579  to distribute software through any other system and a licensee cannot
 580  impose that choice.
 581  
 582  This section is intended to make thoroughly clear what is believed to
 583  be a consequence of the rest of this License.
 584  
 585    8. If the distribution and/or use of the Program is restricted in
 586  certain countries either by patents or by copyrighted interfaces, the
 587  original copyright holder who places the Program under this License
 588  may add an explicit geographical distribution limitation excluding
 589  those countries, so that distribution is permitted only in or among
 590  countries not thus excluded.  In such case, this License incorporates
 591  the limitation as if written in the body of this License.
 592  
 593    9. The Free Software Foundation may publish revised and/or new versions
 594  of the General Public License from time to time.  Such new versions will
 595  be similar in spirit to the present version, but may differ in detail to
 596  address new problems or concerns.
 597  
 598  Each version is given a distinguishing version number.  If the Program
 599  specifies a version number of this License which applies to it and "any
 600  later version", you have the option of following the terms and conditions
 601  either of that version or of any later version published by the Free
 602  Software Foundation.  If the Program does not specify a version number of
 603  this License, you may choose any version ever published by the Free Software
 604  Foundation.
 605  
 606    10. If you wish to incorporate parts of the Program into other free
 607  programs whose distribution conditions are different, write to the author
 608  to ask for permission.  For software which is copyrighted by the Free
 609  Software Foundation, write to the Free Software Foundation; we sometimes
 610  make exceptions for this.  Our decision will be guided by the two goals
 611  of preserving the free status of all derivatives of our free software and
 612  of promoting the sharing and reuse of software generally.
 613  
 614                              NO WARRANTY
 615  
 616    11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 617  FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 618  OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 619  PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 620  OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 621  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 622  TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 623  PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 624  REPAIR OR CORRECTION.
 625  
 626    12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 627  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 628  REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 629  INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 630  OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 631  TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 632  YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 633  PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 634  POSSIBILITY OF SUCH DAMAGES.
 635  
 636                       END OF TERMS AND CONDITIONS
 637  
 638              How to Apply These Terms to Your New Programs
 639  
 640    If you develop a new program, and you want it to be of the greatest
 641  possible use to the public, the best way to achieve this is to make it
 642  free software which everyone can redistribute and change under these terms.
 643  
 644    To do so, attach the following notices to the program.  It is safest
 645  to attach them to the start of each source file to most effectively
 646  convey the exclusion of warranty; and each file should have at least
 647  the "copyright" line and a pointer to where the full notice is found.
 648  
 649      <one line to give the program's name and a brief idea of what it does.>
 650      Copyright (C) <year>  <name of author>
 651  
 652      This program is free software; you can redistribute it and/or modify
 653      it under the terms of the GNU General Public License as published by
 654      the Free Software Foundation; either version 2 of the License, or
 655      (at your option) any later version.
 656  
 657      This program is distributed in the hope that it will be useful,
 658      but WITHOUT ANY WARRANTY; without even the implied warranty of
 659      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 660      GNU General Public License for more details.
 661  
 662      You should have received a copy of the GNU General Public License along
 663      with this program; if not, write to the Free Software Foundation, Inc.,
 664      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 665  
 666  Also add information on how to contact you by electronic and paper mail.
 667  
 668  If the program is interactive, make it output a short notice like this
 669  when it starts in an interactive mode:
 670  
 671      Gnomovision version 69, Copyright (C) year name of author
 672      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
 673      This is free software, and you are welcome to redistribute it
 674      under certain conditions; type `show c' for details.
 675  
 676  The hypothetical commands `show w' and `show c' should show the appropriate
 677  parts of the General Public License.  Of course, the commands you use may
 678  be called something other than `show w' and `show c'; they could even be
 679  mouse-clicks or menu items--whatever suits your program.
 680  
 681  You should also get your employer (if you work as a programmer) or your
 682  school, if any, to sign a "copyright disclaimer" for the program, if
 683  necessary.  Here is a sample; alter the names:
 684  
 685    Yoyodyne, Inc., hereby disclaims all copyright interest in the program
 686    `Gnomovision' (which makes passes at compilers) written by James Hacker.
 687  
 688    <signature of Ty Coon>, 1 April 1989
 689    Ty Coon, President of Vice
 690  
 691  This General Public License does not permit incorporating your program into
 692  proprietary programs.  If your program is a subroutine library, you may
 693  consider it more useful to permit linking proprietary applications with the
 694  library.  If this is what you want to do, use the GNU Lesser General
 695  Public License instead of this License.
 696  
 697  
 698  ## tota11y by Khan Academy

 699  Various parts of Sa11y is adapted from [Tota11y by Khan Academy.](https://github.com/Khan/tota11y)
 700  
 701  The MIT License (MIT)
 702  
 703  Copyright (c) 2016 Khan Academy
 704  
 705  Permission is hereby granted, free of charge, to any person obtaining a copy
 706  of this software and associated documentation files (the "Software"), to deal
 707  in the Software without restriction, including without limitation the rights
 708  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 709  copies of the Software, and to permit persons to whom the Software is
 710  furnished to do so, subject to the following conditions:
 711  
 712  The above copyright notice and this permission notice shall be included in all
 713  copies or substantial portions of the Software.
 714  
 715  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 716  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 717  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 718  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 719  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 720  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 721  SOFTWARE.
 722  
 723  ## Tippy.js by Atomiks

 724  MIT License
 725  
 726  Copyright (c) 2017-present atomiks
 727  
 728  Permission is hereby granted, free of charge, to any person obtaining a copy
 729  of this software and associated documentation files (the "Software"), to deal
 730  in the Software without restriction, including without limitation the rights
 731  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 732  copies of the Software, and to permit persons to whom the Software is
 733  furnished to do so, subject to the following conditions:
 734  
 735  The above copyright notice and this permission notice shall be included in all
 736  copies or substantial portions of the Software.
 737  
 738  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 739  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 740  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 741  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 742  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 743  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 744  SOFTWARE.
 745  
 746  https://github.com/atomiks/tippyjs/blob/master/LICENSE
 747  
 748  ## Icons by Font Awesome

 749  The SVG icons used in this project are created by Font Awesome. View [FontAwesome's license.](https://fontawesome.com/license/free)
 750  
 751  ## Color Contrast plugin

 752  The [colour contrast plugin](https://github.com/jasonday/color-contrast) (MIT license) was created by Jason Day.