Several countries still have laws on the books that actually prevent things like the GPL and CC licenses from being used. The laws in at least a few cases are such that no open licenses will be leagal until they get changed. The author does a great job of making it all make sense as best he can.
In other leagal news, the SCO Vs. Linux case may finally be done. Let's hope that no one else tries this. It's been years and lots of confusion with this case. Support the FSF and Linux Foundation so that we all can enjoy the use of the open source tools we have gone to depend on.