http://zzz.i2p/posts/15065
If the source code is in the public domain, that is a special case of noncopylefted free software, which means that some copies or modified versions may not be free at all." Free Software , Free Society v3 page 82 https://www.gnu.org/doc/fsfs3-hardcover.pdf This is really not nice treatment to i2p devs and their contributors for keeping them always vulnerable to a proprietary fork from whoever for whatever reason. not talking about gratis...