I am interested in modifying the SQLite source code and making it available as an experimental public fork (GitHub, Google Code, etc.)However, the SQLite source code is currently in the public domain.  If I fork, am I allowed to relicense using GNU GPL 3+?  I would like my changes to the original source to be licensed under GNU GPL 3+.Using this Q as an example, I plan to commit the last official source to a git repo and make a note in README about the original source code.  I assume this will satisfy this clause: The work must carry prominent notices stating that you modified it, and giving a relevant date.
Forking SQLite source
licensing;gpl
SQLite is public domain, you can do what you want with it (except probably claim it as your own)Anyone is free to copy, modify, publish, use, compile, sell, or  distribute the original SQLite code, either in source code form or as  a compiled binary, for any purpose, commercial or non-commercial, and  by any means.But it would be polite and honest to mention that the original source is public domain even though your release is GPL. Then people have the option of building on your GPL'ed code or returning to the original 