Clarify the quantum license (#1042)

* Clarify the license for files we have signoff on

* Update against the currently signed off files

* Remove unused and not clearly licensed headers

* Replace an #endif I accidentally removed while resolving merge conflicts

1 files changed, 656 insertions, 0 deletions

diff --git a/license_GPLv3.md b/license_GPLv3.md
new file mode 100644
index 0000000000..2061be2b73
--- /dev/null
+++ b/license_GPLv3.md
@@ -0,0 +1,656 @@
+The GNU General Public License, Version 3, 29 June 2007 (GPLv3)
+===============================================================
+
+> Copyright © 2007
+> Free Software Foundation, Inc.
+> <<http://fsf.org/>>
+
+Everyone is permitted to copy and distribute verbatim copies of this license
+document, but changing it is not allowed.
+
+
+Preamble
+--------
+
+The GNU General Public License is a free, copyleft license for software and
+other kinds of works.
+
+The licenses for most software and other practical works are designed to take
+away your freedom to share and change the works. By contrast, the GNU General
+Public License is intended to guarantee your freedom to share and change all
+versions of a program--to make sure it remains free software for all its users.
+We, the Free Software Foundation, use the GNU General Public License for most of
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+
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+--------------------
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+
+### 12. No Surrender of Others' Freedom.
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+
+### 14. Revised Versions of this License.
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+PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
+INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
+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), EVEN IF SUCH HOLDER OR OTHER PARTY
+HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided above cannot
+be given local legal effect according to their terms, reviewing courts shall
+apply local law that most closely approximates an absolute waiver of all civil
+liability in connection with the Program, unless a warranty or assumption of
+liability accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+
+How to Apply These Terms to Your New Programs
+---------------------------------------------
+
+If you develop a new program, and you want it to be of the greatest possible use
+to the public, the best way to achieve this is to make it free software which
+everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach
+them to the start of each source file to most effectively state the exclusion of
+warranty; and each file should have at least the "copyright" line and a pointer
+to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 (at your option)
+    any later version.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the 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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice like
+this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
+    This is free software, and you are welcome to redistribute it under certain
+    conditions; type 'show c' for details.
+
+The hypothetical commands 'show w' and 'show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands might be
+different; for a GUI interface, you would use an "about box".
+
+You should also get your employer (if you work as a programmer) or school, if
+any, to sign a "copyright disclaimer" for the program, if necessary. For more
+information on this, and how to apply and follow the GNU GPL, see
+<<http://www.gnu.org/licenses/>>.
+
+The GNU General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may consider
+it more useful to permit linking proprietary applications with the library. If
+this is what you want to do, use the GNU Lesser General Public License instead
+of this License. But first, please read
+<<http://www.gnu.org/philosophy/why-not-lgpl.html>>.