This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
It means you can't modify Hibernate and sell it as a commercial product (e.g. "Sleeping Beauty"), but you can sell your application code which uses Hibernate (for example an accounts system or bulletin board).