Even easier - let's say I send you a bunch of GPL code and tell you I'll pay you 1000 dollars if you never send it to anybody else. Easy money right? If you sti

Even easier - let's say I send you a bunch of GPL code and tell you I'll pay you 1000 dollars if you never send it to anybody else. Easy money right? If you still send the code, I can't sue you for license violation - GPL allows you to do that. But you certainly took $1000 and didn't do what I paid you for. It's not just legal but sneaky, it's a violation of our contract, despite the fact the license is not violated - two different things.