github.com/aquanetwork/aquachain@v1.7.8/COPYING (about)

     1                      GNU GENERAL PUBLIC LICENSE
     2                         Version 3, 29 June 2007
     3  
     4   Copyright (C) 2017 The Aquachain Authors.
     5   Copyright (C) 2014 The Ethereum Authors.
     6   Everyone is permitted to copy and distribute verbatim copies
     7   of this license document, but changing it is not allowed.
     8  
     9                              Preamble
    10  
    11    The GNU General Public License is a free, copyleft license for
    12  software and other kinds of works.
    13  
    14    The licenses for most software and other practical works are designed
    15  to take away your freedom to share and change the works.  By contrast,
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    19  GNU General Public License for most of our software; it applies also to
    20  any other work released this way by its authors.  You can apply it to
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    22  
    23    When we speak of free software, we are referring to freedom, not
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    35    For example, if you distribute copies of such a program, whether
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    40  
    41    Developers that use the GNU GPL protect your rights with two steps:
    42  (1) assert copyright on the software, and (2) offer you this License
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    45    For the developers' and authors' protection, the GPL clearly explains
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    51    Some devices are designed to deny users access to install or run
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    57  have designed this version of the GPL to prohibit the practice for those
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    62    Finally, every program is threatened constantly by software patents.
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    69    The precise terms and conditions for copying, distribution and
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    71  
    72                         TERMS AND CONDITIONS
    73  
    74    0. Definitions.
    75  
    76    "This License" refers to version 3 of the GNU General Public License.
    77  
    78    "Copyright" also means copyright-like laws that apply to other kinds of
    79  works, such as semiconductor masks.
    80  
    81    "The Program" refers to any copyrightable work licensed under this
    82  License.  Each licensee is addressed as "you".  "Licensees" and
    83  "recipients" may be individuals or organizations.
    84  
    85    To "modify" a work means to copy from or adapt all or part of the work
    86  in a fashion requiring copyright permission, other than the making of an
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    88  earlier work or a work "based on" the earlier work.
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    90    A "covered work" means either the unmodified Program or a work based
    91  on the Program.
    92  
    93    To "propagate" a work means to do anything with it that, without
    94  permission, would make you directly or secondarily liable for
    95  infringement under applicable copyright law, except executing it on a
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    98  public, and in some countries other activities as well.
    99  
   100    To "convey" a work means any kind of propagation that enables other
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   103  
   104    An interactive user interface displays "Appropriate Legal Notices"
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   107  tells the user that there is no warranty for the work (except to the
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   111  menu, a prominent item in the list meets this criterion.
   112  
   113    1. Source Code.
   114  
   115    The "source code" for a work means the preferred form of the work
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   135    The "Corresponding Source" for a work in object code form means all
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   148    The Corresponding Source need not include anything that users
   149  can regenerate automatically from other parts of the Corresponding
   150  Source.
   151  
   152    The Corresponding Source for a work in source code form is that
   153  same work.
   154  
   155    2. Basic Permissions.
   156  
   157    All rights granted under this License are granted for the term of
   158  copyright on the Program, and are irrevocable provided the stated
   159  conditions are met.  This License explicitly affirms your unlimited
   160  permission to run the unmodified Program.  The output from running a
   161  covered work is covered by this License only if the output, given its
   162  content, constitutes a covered work.  This License acknowledges your
   163  rights of fair use or other equivalent, as provided by copyright law.
   164  
   165    You may make, run and propagate covered works that you do not
   166  convey, without conditions so long as your license otherwise remains
   167  in force.  You may convey covered works to others for the sole purpose
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   170  the terms of this License in conveying all material for which you do
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   172  for you must do so exclusively on your behalf, under your direction
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   174  your copyrighted material outside their relationship with you.
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   176    Conveying under any other circumstances is permitted solely under
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   178  makes it unnecessary.
   179  
   180    3. Protecting Users' Legal Rights From Anti-Circumvention Law.
   181  
   182    No covered work shall be deemed part of an effective technological
   183  measure under any applicable law fulfilling obligations under article
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   186  measures.
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   188    When you convey a covered work, you waive any legal power to forbid
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   192  modification of the work as a means of enforcing, against the work's
   193  users, your or third parties' legal rights to forbid circumvention of
   194  technological measures.
   195  
   196    4. Conveying Verbatim Copies.
   197  
   198    You may convey verbatim copies of the Program's source code as you
   199  receive it, in any medium, provided that you conspicuously and
   200  appropriately publish on each copy an appropriate copyright notice;
   201  keep intact all notices stating that this License and any
   202  non-permissive terms added in accord with section 7 apply to the code;
   203  keep intact all notices of the absence of any warranty; and give all
   204  recipients a copy of this License along with the Program.
   205  
   206    You may charge any price or no price for each copy that you convey,
   207  and you may offer support or warranty protection for a fee.
   208  
   209    5. Conveying Modified Source Versions.
   210  
   211    You may convey a work based on the Program, or the modifications to
   212  produce it from the Program, in the form of source code under the
   213  terms of section 4, provided that you also meet all of these conditions:
   214  
   215      a) The work must carry prominent notices stating that you modified
   216      it, and giving a relevant date.
   217  
   218      b) The work must carry prominent notices stating that it is
   219      released under this License and any conditions added under section
   220      7.  This requirement modifies the requirement in section 4 to
   221      "keep intact all notices".
   222  
   223      c) You must license the entire work, as a whole, under this
   224      License to anyone who comes into possession of a copy.  This
   225      License will therefore apply, along with any applicable section 7
   226      additional terms, to the whole of the work, and all its parts,
   227      regardless of how they are packaged.  This License gives no
   228      permission to license the work in any other way, but it does not
   229      invalidate such permission if you have separately received it.
   230  
   231      d) If the work has interactive user interfaces, each must display
   232      Appropriate Legal Notices; however, if the Program has interactive
   233      interfaces that do not display Appropriate Legal Notices, your
   234      work need not make them do so.
   235  
   236    A compilation of a covered work with other separate and independent
   237  works, which are not by their nature extensions of the covered work,
   238  and which are not combined with it such as to form a larger program,
   239  in or on a volume of a storage or distribution medium, is called an
   240  "aggregate" if the compilation and its resulting copyright are not
   241  used to limit the access or legal rights of the compilation's users
   242  beyond what the individual works permit.  Inclusion of a covered work
   243  in an aggregate does not cause this License to apply to the other
   244  parts of the aggregate.
   245  
   246    6. Conveying Non-Source Forms.
   247  
   248    You may convey a covered work in object code form under the terms
   249  of sections 4 and 5, provided that you also convey the
   250  machine-readable Corresponding Source under the terms of this License,
   251  in one of these ways:
   252  
   253      a) Convey the object code in, or embodied in, a physical product
   254      (including a physical distribution medium), accompanied by the
   255      Corresponding Source fixed on a durable physical medium
   256      customarily used for software interchange.
   257  
   258      b) Convey the object code in, or embodied in, a physical product
   259      (including a physical distribution medium), accompanied by a
   260      written offer, valid for at least three years and valid for as
   261      long as you offer spare parts or customer support for that product
   262      model, to give anyone who possesses the object code either (1) a
   263      copy of the Corresponding Source for all the software in the
   264      product that is covered by this License, on a durable physical
   265      medium customarily used for software interchange, for a price no
   266      more than your reasonable cost of physically performing this
   267      conveying of source, or (2) access to copy the
   268      Corresponding Source from a network server at no charge.
   269  
   270      c) Convey individual copies of the object code with a copy of the
   271      written offer to provide the Corresponding Source.  This
   272      alternative is allowed only occasionally and noncommercially, and
   273      only if you received the object code with such an offer, in accord
   274      with subsection 6b.
   275  
   276      d) Convey the object code by offering access from a designated
   277      place (gratis or for a charge), and offer equivalent access to the
   278      Corresponding Source in the same way through the same place at no
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   281      copy the object code is a network server, the Corresponding Source
   282      may be on a different server (operated by you or a third party)
   283      that supports equivalent copying facilities, provided you maintain
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   286      Corresponding Source, you remain obligated to ensure that it is
   287      available for as long as needed to satisfy these requirements.
   288  
   289      e) Convey the object code using peer-to-peer transmission, provided
   290      you inform other peers where the object code and Corresponding
   291      Source of the work are being offered to the general public at no
   292      charge under subsection 6d.
   293  
   294    A separable portion of the object code, whose source code is excluded
   295  from the Corresponding Source as a System Library, need not be
   296  included in conveying the object code work.
   297  
   298    A "User Product" is either (1) a "consumer product", which means any
   299  tangible personal property which is normally used for personal, family,
   300  or household purposes, or (2) anything designed or sold for incorporation
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   309  the only significant mode of use of the product.
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   311    "Installation Information" for a User Product means any methods,
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   317  modification has been made.
   318  
   319    If you convey an object code work under this section in, or with, or
   320  specifically for use in, a User Product, and the conveying occurs as
   321  part of a transaction in which the right of possession and use of the
   322  User Product is transferred to the recipient in perpetuity or for a
   323  fixed term (regardless of how the transaction is characterized), the
   324  Corresponding Source conveyed under this section must be accompanied
   325  by the Installation Information.  But this requirement does not apply
   326  if neither you nor any third party retains the ability to install
   327  modified object code on the User Product (for example, the work has
   328  been installed in ROM).
   329  
   330    The requirement to provide Installation Information does not include a
   331  requirement to continue to provide support service, warranty, or updates
   332  for a work that has been modified or installed by the recipient, or for
   333  the User Product in which it has been modified or installed.  Access to a
   334  network may be denied when the modification itself materially and
   335  adversely affects the operation of the network or violates the rules and
   336  protocols for communication across the network.
   337  
   338    Corresponding Source conveyed, and Installation Information provided,
   339  in accord with this section must be in a format that is publicly
   340  documented (and with an implementation available to the public in
   341  source code form), and must require no special password or key for
   342  unpacking, reading or copying.
   343  
   344    7. Additional Terms.
   345  
   346    "Additional permissions" are terms that supplement the terms of this
   347  License by making exceptions from one or more of its conditions.
   348  Additional permissions that are applicable to the entire Program shall
   349  be treated as though they were included in this License, to the extent
   350  that they are valid under applicable law.  If additional permissions
   351  apply only to part of the Program, that part may be used separately
   352  under those permissions, but the entire Program remains governed by
   353  this License without regard to the additional permissions.
   354  
   355    When you convey a copy of a covered work, you may at your option
   356  remove any additional permissions from that copy, or from any part of
   357  it.  (Additional permissions may be written to require their own
   358  removal in certain cases when you modify the work.)  You may place
   359  additional permissions on material, added by you to a covered work,
   360  for which you have or can give appropriate copyright permission.
   361  
   362    Notwithstanding any other provision of this License, for material you
   363  add to a covered work, you may (if authorized by the copyright holders of
   364  that material) supplement the terms of this License with terms:
   365  
   366      a) Disclaiming warranty or limiting liability differently from the
   367      terms of sections 15 and 16 of this License; or
   368  
   369      b) Requiring preservation of specified reasonable legal notices or
   370      author attributions in that material or in the Appropriate Legal
   371      Notices displayed by works containing it; or
   372  
   373      c) Prohibiting misrepresentation of the origin of that material, or
   374      requiring that modified versions of such material be marked in
   375      reasonable ways as different from the original version; or
   376  
   377      d) Limiting the use for publicity purposes of names of licensors or
   378      authors of the material; or
   379  
   380      e) Declining to grant rights under trademark law for use of some
   381      trade names, trademarks, or service marks; or
   382  
   383      f) Requiring indemnification of licensors and authors of that
   384      material by anyone who conveys the material (or modified versions of
   385      it) with contractual assumptions of liability to the recipient, for
   386      any liability that these contractual assumptions directly impose on
   387      those licensors and authors.
   388  
   389    All other non-permissive additional terms are considered "further
   390  restrictions" within the meaning of section 10.  If the Program as you
   391  received it, or any part of it, contains a notice stating that it is
   392  governed by this License along with a term that is a further
   393  restriction, you may remove that term.  If a license document contains
   394  a further restriction but permits relicensing or conveying under this
   395  License, you may add to a covered work material governed by the terms
   396  of that license document, provided that the further restriction does
   397  not survive such relicensing or conveying.
   398  
   399    If you add terms to a covered work in accord with this section, you
   400  must place, in the relevant source files, a statement of the
   401  additional terms that apply to those files, or a notice indicating
   402  where to find the applicable terms.
   403  
   404    Additional terms, permissive or non-permissive, may be stated in the
   405  form of a separately written license, or stated as exceptions;
   406  the above requirements apply either way.
   407  
   408    8. Termination.
   409  
   410    You may not propagate or modify a covered work except as expressly
   411  provided under this License.  Any attempt otherwise to propagate or
   412  modify it is void, and will automatically terminate your rights under
   413  this License (including any patent licenses granted under the third
   414  paragraph of section 11).
   415  
   416    However, if you cease all violation of this License, then your
   417  license from a particular copyright holder is reinstated (a)
   418  provisionally, unless and until the copyright holder explicitly and
   419  finally terminates your license, and (b) permanently, if the copyright
   420  holder fails to notify you of the violation by some reasonable means
   421  prior to 60 days after the cessation.
   422  
   423    Moreover, your license from a particular copyright holder is
   424  reinstated permanently if the copyright holder notifies you of the
   425  violation by some reasonable means, this is the first time you have
   426  received notice of violation of this License (for any work) from that
   427  copyright holder, and you cure the violation prior to 30 days after
   428  your receipt of the notice.
   429  
   430    Termination of your rights under this section does not terminate the
   431  licenses of parties who have received copies or rights from you under
   432  this License.  If your rights have been terminated and not permanently
   433  reinstated, you do not qualify to receive new licenses for the same
   434  material under section 10.
   435  
   436    9. Acceptance Not Required for Having Copies.
   437  
   438    You are not required to accept this License in order to receive or
   439  run a copy of the Program.  Ancillary propagation of a covered work
   440  occurring solely as a consequence of using peer-to-peer transmission
   441  to receive a copy likewise does not require acceptance.  However,
   442  nothing other than this License grants you permission to propagate or
   443  modify any covered work.  These actions infringe copyright if you do
   444  not accept this License.  Therefore, by modifying or propagating a
   445  covered work, you indicate your acceptance of this License to do so.
   446  
   447    10. Automatic Licensing of Downstream Recipients.
   448  
   449    Each time you convey a covered work, the recipient automatically
   450  receives a license from the original licensors, to run, modify and
   451  propagate that work, subject to this License.  You are not responsible
   452  for enforcing compliance by third parties with this License.
   453  
   454    An "entity transaction" is a transaction transferring control of an
   455  organization, or substantially all assets of one, or subdividing an
   456  organization, or merging organizations.  If propagation of a covered
   457  work results from an entity transaction, each party to that
   458  transaction who receives a copy of the work also receives whatever
   459  licenses to the work the party's predecessor in interest had or could
   460  give under the previous paragraph, plus a right to possession of the
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   462  the predecessor has it or can get it with reasonable efforts.
   463  
   464    You may not impose any further restrictions on the exercise of the
   465  rights granted or affirmed under this License.  For example, you may
   466  not impose a license fee, royalty, or other charge for exercise of
   467  rights granted under this License, and you may not initiate litigation
   468  (including a cross-claim or counterclaim in a lawsuit) alleging that
   469  any patent claim is infringed by making, using, selling, offering for
   470  sale, or importing the Program or any portion of it.
   471  
   472    11. Patents.
   473  
   474    A "contributor" is a copyright holder who authorizes use under this
   475  License of the Program or a work on which the Program is based.  The
   476  work thus licensed is called the contributor's "contributor version".
   477  
   478    A contributor's "essential patent claims" are all patent claims
   479  owned or controlled by the contributor, whether already acquired or
   480  hereafter acquired, that would be infringed by some manner, permitted
   481  by this License, of making, using, or selling its contributor version,
   482  but do not include claims that would be infringed only as a
   483  consequence of further modification of the contributor version.  For
   484  purposes of this definition, "control" includes the right to grant
   485  patent sublicenses in a manner consistent with the requirements of
   486  this License.
   487  
   488    Each contributor grants you a non-exclusive, worldwide, royalty-free
   489  patent license under the contributor's essential patent claims, to
   490  make, use, sell, offer for sale, import and otherwise run, modify and
   491  propagate the contents of its contributor version.
   492  
   493    In the following three paragraphs, a "patent license" is any express
   494  agreement or commitment, however denominated, not to enforce a patent
   495  (such as an express permission to practice a patent or covenant not to
   496  sue for patent infringement).  To "grant" such a patent license to a
   497  party means to make such an agreement or commitment not to enforce a
   498  patent against the party.
   499  
   500    If you convey a covered work, knowingly relying on a patent license,
   501  and the Corresponding Source of the work is not available for anyone
   502  to copy, free of charge and under the terms of this License, through a
   503  publicly available network server or other readily accessible means,
   504  then you must either (1) cause the Corresponding Source to be so
   505  available, or (2) arrange to deprive yourself of the benefit of the
   506  patent license for this particular work, or (3) arrange, in a manner
   507  consistent with the requirements of this License, to extend the patent
   508  license to downstream recipients.  "Knowingly relying" means you have
   509  actual knowledge that, but for the patent license, your conveying the
   510  covered work in a country, or your recipient's use of the covered work
   511  in a country, would infringe one or more identifiable patents in that
   512  country that you have reason to believe are valid.
   513  
   514    If, pursuant to or in connection with a single transaction or
   515  arrangement, you convey, or propagate by procuring conveyance of, a
   516  covered work, and grant a patent license to some of the parties
   517  receiving the covered work authorizing them to use, propagate, modify
   518  or convey a specific copy of the covered work, then the patent license
   519  you grant is automatically extended to all recipients of the covered
   520  work and works based on it.
   521  
   522    A patent license is "discriminatory" if it does not include within
   523  the scope of its coverage, prohibits the exercise of, or is
   524  conditioned on the non-exercise of one or more of the rights that are
   525  specifically granted under this License.  You may not convey a covered
   526  work if you are a party to an arrangement with a third party that is
   527  in the business of distributing software, under which you make payment
   528  to the third party based on the extent of your activity of conveying
   529  the work, and under which the third party grants, to any of the
   530  parties who would receive the covered work from you, a discriminatory
   531  patent license (a) in connection with copies of the covered work
   532  conveyed by you (or copies made from those copies), or (b) primarily
   533  for and in connection with specific products or compilations that
   534  contain the covered work, unless you entered into that arrangement,
   535  or that patent license was granted, prior to 28 March 2007.
   536  
   537    Nothing in this License shall be construed as excluding or limiting
   538  any implied license or other defenses to infringement that may
   539  otherwise be available to you under applicable patent law.
   540  
   541    12. No Surrender of Others' Freedom.
   542  
   543    If conditions are imposed on you (whether by court order, agreement or
   544  otherwise) that contradict the conditions of this License, they do not
   545  excuse you from the conditions of this License.  If you cannot convey a
   546  covered work so as to satisfy simultaneously your obligations under this
   547  License and any other pertinent obligations, then as a consequence you may
   548  not convey it at all.  For example, if you agree to terms that obligate you
   549  to collect a royalty for further conveying from those to whom you convey
   550  the Program, the only way you could satisfy both those terms and this
   551  License would be to refrain entirely from conveying the Program.
   552  
   553    13. Use with the GNU Affero General Public License.
   554  
   555    Notwithstanding any other provision of this License, you have
   556  permission to link or combine any covered work with a work licensed
   557  under version 3 of the GNU Affero General Public License into a single
   558  combined work, and to convey the resulting work.  The terms of this
   559  License will continue to apply to the part which is the covered work,
   560  but the special requirements of the GNU Affero General Public License,
   561  section 13, concerning interaction through a network will apply to the
   562  combination as such.
   563  
   564    14. Revised Versions of this License.
   565  
   566    The Free Software Foundation may publish revised and/or new versions of
   567  the GNU General Public License from time to time.  Such new versions will
   568  be similar in spirit to the present version, but may differ in detail to
   569  address new problems or concerns.
   570  
   571    Each version is given a distinguishing version number.  If the
   572  Program specifies that a certain numbered version of the GNU General
   573  Public License "or any later version" applies to it, you have the
   574  option of following the terms and conditions either of that numbered
   575  version or of any later version published by the Free Software
   576  Foundation.  If the Program does not specify a version number of the
   577  GNU General Public License, you may choose any version ever published
   578  by the Free Software Foundation.
   579  
   580    If the Program specifies that a proxy can decide which future
   581  versions of the GNU General Public License can be used, that proxy's
   582  public statement of acceptance of a version permanently authorizes you
   583  to choose that version for the Program.
   584  
   585    Later license versions may give you additional or different
   586  permissions.  However, no additional obligations are imposed on any
   587  author or copyright holder as a result of your choosing to follow a
   588  later version.
   589  
   590    15. Disclaimer of Warranty.
   591  
   592    THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
   593  APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
   594  HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
   595  OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
   596  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   597  PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
   598  IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
   599  ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
   600  
   601    16. Limitation of Liability.
   602  
   603    IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
   604  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
   605  THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
   606  GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
   607  USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
   608  DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
   609  PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
   610  EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
   611  SUCH DAMAGES.
   612  
   613    17. Interpretation of Sections 15 and 16.
   614  
   615    If the disclaimer of warranty and limitation of liability provided
   616  above cannot be given local legal effect according to their terms,
   617  reviewing courts shall apply local law that most closely approximates
   618  an absolute waiver of all civil liability in connection with the
   619  Program, unless a warranty or assumption of liability accompanies a
   620  copy of the Program in return for a fee.