Gregory's ServerIMHO, it's worth the time to read the GNU GPL.
I read an great book, 'The Hacker Ethic', ~8 years ago, which explored the history, evolution, and responsibilities of free software hacking and the GNU/Linux ecosystem. Its content was on a site I thought was HackerEthic.org. (The Internet Archive's Wayback Machine crawls of that domain, however, are incongruous with the book.)
I wonder if Pekka Himanen's 2002 'The Hacker Ethic' book has any relation to the book I read.