And yes, the GPLv3 is extremely dangerous, with its patent crap, and it's anti-tivoing clause. Moreso than any other attribute of software, proprietary or free, that I can think of. For example, just imagine how devastating it would be if one bit of GPLv3 software made its way onto iOS.
Edit: Thanks for the downvotes, guys. Yes, big shock, not everybody loves GPLv3, and some of us actually have legitimate reasons to do so.