Update License.md

change to GPL-3

License.md

@@ -1,21 +1,8 @@
 # License
 
-This project is work of the [United States government](https://www.usa.gov/) by US federal employees in the Department of Commerce as part of their official duties. Software code created by U.S. Government employees is not subject to copyright in the United States (17 U.S.C. §105). The United States/Department of Commerce reserves all rights to seek and obtain copyright protection in countries other than the United States for Software authored in its entirety by the Department of Commerce. To this end, the Department of Commerce hereby grants to Recipient a royalty-free, nonexclusive license to use, copy, and create derivative works of the Software outside of the United States.
-
-Additionally, we waive copyright and related rights in the work worldwide through the CC0 1.0 Universal public domain dedication.
-
-## CC0 1.0 Universal Summary
-
-This is a human-readable summary of the [Legal Code (read the full text)](https://creativecommons.org/publicdomain/zero/1.0/legalcode).
-
-### No Copyright
+The rCAX package as a whole is distributed under GPL-3 ([GNU GENERAL PUBLIC
+LICENSE version 3](https://www.tldrlegal.com/license/gnu-general-public-license-v3-gpl-3)).
 
-The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
+In addition this software has the following license addendum:
 
-You can copy, modify, distribute, and perform the work, even for commercial purposes, all without asking permission.
-
-### Other Information
-
-In no way are the patent or trademark rights of any person affected by CC0, nor are the rights that other persons may have in the work or in how the work is used, such as publicity or privacy rights.
-
-Unless expressly stated otherwise, the person who associated a work with this deed makes no warranties about the work, and disclaims liability for all uses of the work, to the fullest extent permitted by applicable law. When using or citing the work, you should not imply endorsement by the author or the affirmer.
+This project is work of the [United States government](https://www.usa.gov/) by US federal employees in the Department of Commerce as part of their official duties. Software code created by U.S. Government employees is not subject to copyright in the United States (17 U.S.C. §105). The United States/Department of Commerce reserves all rights to seek and obtain copyright protection in countries other than the United States for Software authored in its entirety by the Department of Commerce. To this end, the Department of Commerce hereby grants to Recipient a royalty-free, nonexclusive license to use, copy, and create derivative works of the Software outside of the United States.