Matlab License Key Freely Available (GPL 2.0++) For Linux, use license_key_compatible_releases as required at https://github.com/freebsd/freebsd. In addition, you should note that there is no requirement for using GnuPG, so it is all you’ll need. GNU GPLv3 requires GnuPG. (GPL 3++) For Linux, use license_key_source_keyfreely included at https://github.com/freebsd/linux-freebsd. Use freebsd in the linux package manager of your choice. For non-freebsd users, the freebsd package manager is included. (GPL in Windows) For Windows, use license_key_source_copyright. This provides a legal copyright notice if you use your system, but it also provides it to others if they do what you say. (SDL 2.4+++) For Debian, use license_key_source_copyright. This allows for non-freebsd users to use your system as a Debian source, without licensing, without copyright protection, and without a fee. The GNU GPLv3 in Debian uses GPL to distribute to those users, and is a special license and not a license control or non-merger license. There is also a GPLv3 license, so that all Debian users can use versions of Debian. This makes you much more likely to use packages if they are free versions as opposed to proprietary ones, but not as a requirement for use. This license also allows you to use GPLv3 versions when you are not intending to distribute to any other users, or for the purpose of making them legally own. See http://opensource.org/licenses/gplv3. See also http://plasma.w3.org/license.html.