add improved legal protections clauses

The license for software created by Whonix is the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version with additional terms applicable per GNU GPL version 3 section 7.

The additional terms are based on the Doom 3 license which is Debian refers to as `GPL-3+-with-id-software-additional-terms`, which is Debian DFSG [1] (The Debian Free Software Guidelines) approved and which is therefore suitable for Debian `main`. Whonix made applied minimal changes to it:

* Rewrite `The Doom 3 BFG Edition GPL Source Code` to the more common `this program` which is used throughout the GPL.
* Added a "trump clause" [2], in other words, any conflicts or disputes between the additional terms and the GPLv3 shall be resolved in favor of the GPLv3 by adding `Notwithstanding any other provision of this License` (as mentioned in GPL FAQ [3]) at the beginning of the additional terms.

[1] https://www.debian.org/social_contract#guidelines
[2] https://www.fsf.org/news/canonical-updated-licensing-terms
[3] https://www.gnu.org/licenses/gpl-faq.html#v3Notwithstanding

For more considerations, see also:
https://www.whonix.org/wiki/Dev/Licensing

COPYING

@@ -1,8 +1,8 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 
 Files: *
-Copyright: 2012 - 2018 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
+Copyright: 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
-License: GPL-3+
+License: GPL-3+-with-whonix-additional-terms
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
@@ -14,8 +14,63 @@ License: GPL-3+
  GNU General Public License for more details.
  .
  You should have received a copy of the GNU General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ along with this program.  If not, see <https://www.gnu.org/licenses/>.
  .
  On Debian systems, the full text of the GNU General Public
  License version 3 can be found in the file
  `/usr/share/common-licenses/GPL-3'.
+ .
+ ADDITIONAL TERMS APPLICABLE per GNU GPL version 3 section 7
+ .
+ Notwithstanding any other provision of this License,
+ in addition, the this program is also subject to certain additional terms.
+ .
+ 1. Replacement of Section 15.  Section 15 of the GPL shall be deleted in its
+ entirety and replaced with the following:
+ .
+ 15. Disclaimer of Warranty.
+ .
+ THE PROGRAM IS PROVIDED WITHOUT ANY WARRANTIES, WHETHER EXPRESSED OR IMPLIED,
+ INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
+ PURPOSE, NON-INFRINGEMENT, TITLE AND MERCHANTABILITY.  THE PROGRAM IS BEING
+ DELIVERED OR MADE AVAILABLE 'AS IS', 'WITH ALL FAULTS' AND WITHOUT WARRANTY OR
+ REPRESENTATION.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
+ PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+ .
+ 2. Replacement of Section 16.  Section 16 of the GPL shall be deleted in its
+ entirety and replaced with the following:
+ .
+ 16. LIMITATION OF LIABILITY.
+ .
+ UNDER NO CIRCUMSTANCES SHALL ANY COPYRIGHT HOLDER OR ITS AFFILIATES, OR ANY
+ OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE
+ LIABLE TO YOU, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, FOR ANY
+ DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, DIRECT, INDIRECT, SPECIAL,
+ INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE USE OR INABILITY TO USE THE PROGRAM OR OTHER DEALINGS WITH
+ THE PROGRAM(INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+ INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
+ PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), WHETHER OR NOT ANY COPYRIGHT HOLDER
+ OR SUCH OTHER PARTY RECEIVES NOTICE OF ANY SUCH DAMAGES AND WHETHER OR NOT SUCH
+ DAMAGES COULD HAVE BEEN FORESEEN.
+ .
+ 3. LEGAL NOTICES; NO TRADEMARK LICENSE; ORIGIN.  You must reproduce faithfully
+ all trademark, copyright and other proprietary and legal notices on any copies
+ of the Program or any other required author attributions.  This license does not
+ grant you rights to use any copyright holder or any other party's name, logo, or
+ trademarks.  Neither the name of the copyright holder or its affiliates, or any
+ other party who modifies and/or conveys the Program may be used to endorse or
+ promote products derived from this software without specific prior written
+ permission.  The origin of the Program must not be misrepresented; you must not
+ claim that you wrote the original Program.  Altered source versions must be
+ plainly marked as such, and must not be misrepresented as being the original
+ Program.
+ .
+ 4. INDEMNIFICATION.  IF YOU CONVEY A COVERED WORK AND AGREE WITH ANY RECIPIENT
+ OF THAT COVERED WORK THAT YOU WILL ASSUME ANY LIABILITY FOR THAT COVERED WORK,
+ YOU HEREBY AGREE TO INDEMNIFY, DEFEND AND HOLD HARMLESS THE OTHER LICENSORS AND
+ AUTHORS OF THAT COVERED WORK FOR ANY DAMAGES, DEMANDS, CLAIMS, LOSSES, CAUSES OF
+ ACTION, LAWSUITS, JUDGMENTS EXPENSES (INCLUDING WITHOUT LIMITATION REASONABLE
+ ATTORNEYS' FEES AND EXPENSES) OR ANY OTHER LIABILITY ARISING FROM, RELATED TO OR
+ IN CONNECTION WITH YOUR ASSUMPTIONS OF LIABILITY.

debian/copyright

@@ -1,8 +1,8 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 
 Files: *
-Copyright: 2012 - 2018 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
+Copyright: 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
-License: GPL-3+
+License: GPL-3+-with-whonix-additional-terms
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
@@ -14,8 +14,63 @@ License: GPL-3+
  GNU General Public License for more details.
  .
  You should have received a copy of the GNU General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ along with this program.  If not, see <https://www.gnu.org/licenses/>.
  .
  On Debian systems, the full text of the GNU General Public
  License version 3 can be found in the file
  `/usr/share/common-licenses/GPL-3'.
+ .
+ ADDITIONAL TERMS APPLICABLE per GNU GPL version 3 section 7
+ .
+ Notwithstanding any other provision of this License,
+ in addition, the this program is also subject to certain additional terms.
+ .
+ 1. Replacement of Section 15.  Section 15 of the GPL shall be deleted in its
+ entirety and replaced with the following:
+ .
+ 15. Disclaimer of Warranty.
+ .
+ THE PROGRAM IS PROVIDED WITHOUT ANY WARRANTIES, WHETHER EXPRESSED OR IMPLIED,
+ INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
+ PURPOSE, NON-INFRINGEMENT, TITLE AND MERCHANTABILITY.  THE PROGRAM IS BEING
+ DELIVERED OR MADE AVAILABLE 'AS IS', 'WITH ALL FAULTS' AND WITHOUT WARRANTY OR
+ REPRESENTATION.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
+ PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+ .
+ 2. Replacement of Section 16.  Section 16 of the GPL shall be deleted in its
+ entirety and replaced with the following:
+ .
+ 16. LIMITATION OF LIABILITY.
+ .
+ UNDER NO CIRCUMSTANCES SHALL ANY COPYRIGHT HOLDER OR ITS AFFILIATES, OR ANY
+ OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE
+ LIABLE TO YOU, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, FOR ANY
+ DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, DIRECT, INDIRECT, SPECIAL,
+ INCIDENTAL, CONSEQUENTIAL OR PUNITIVE DAMAGES ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE USE OR INABILITY TO USE THE PROGRAM OR OTHER DEALINGS WITH
+ THE PROGRAM(INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+ INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
+ PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), WHETHER OR NOT ANY COPYRIGHT HOLDER
+ OR SUCH OTHER PARTY RECEIVES NOTICE OF ANY SUCH DAMAGES AND WHETHER OR NOT SUCH
+ DAMAGES COULD HAVE BEEN FORESEEN.
+ .
+ 3. LEGAL NOTICES; NO TRADEMARK LICENSE; ORIGIN.  You must reproduce faithfully
+ all trademark, copyright and other proprietary and legal notices on any copies
+ of the Program or any other required author attributions.  This license does not
+ grant you rights to use any copyright holder or any other party's name, logo, or
+ trademarks.  Neither the name of the copyright holder or its affiliates, or any
+ other party who modifies and/or conveys the Program may be used to endorse or
+ promote products derived from this software without specific prior written
+ permission.  The origin of the Program must not be misrepresented; you must not
+ claim that you wrote the original Program.  Altered source versions must be
+ plainly marked as such, and must not be misrepresented as being the original
+ Program.
+ .
+ 4. INDEMNIFICATION.  IF YOU CONVEY A COVERED WORK AND AGREE WITH ANY RECIPIENT
+ OF THAT COVERED WORK THAT YOU WILL ASSUME ANY LIABILITY FOR THAT COVERED WORK,
+ YOU HEREBY AGREE TO INDEMNIFY, DEFEND AND HOLD HARMLESS THE OTHER LICENSORS AND
+ AUTHORS OF THAT COVERED WORK FOR ANY DAMAGES, DEMANDS, CLAIMS, LOSSES, CAUSES OF
+ ACTION, LAWSUITS, JUDGMENTS EXPENSES (INCLUDING WITHOUT LIMITATION REASONABLE
+ ATTORNEYS' FEES AND EXPENSES) OR ANY OTHER LIABILITY ARISING FROM, RELATED TO OR
+ IN CONNECTION WITH YOUR ASSUMPTIONS OF LIABILITY.