This was more of a pain for SQLite than it was worth. It requires a lot more paperwork than just giving it a BSD (or similar) license.
That said, it's a warm fuzzy feeling to read "The author disclaims copyright to this source code. In place of a legal notice, here is a blessing: may you do good and not evil. May you find forgiveness for yourself and forgive others. May you share freely, never taking more than you give."