To add to Wilf's comment - The more you try to restrict your audience from using your content as they want, the more you raise a generation who considers your products lacking value. You can add no encryption, restriction, or locking mechanism that is so powerful that an army of dedicated hackers cannot break. And ok, one more thing while I'm rambling - Innocent until proven guilty. Lay off the "3 strikes" idiotic idea until you are willing to take every one you accuse to court and prove your accusations before a jury of their peers.