In http://www.simple-talk.com/opinion/geek-of-the-week/dr-richa... he specifically says that if he knew more about copyright, he would have released under the Apache 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."