On intellectual property:
Imagine that I invented a genuine perpetual-motion machine and sketched out the design on a piece of paper. You happen to see the sketch, grasp what it is and how to build it, and build one yourself. Have you stolen anything from me?
If they answer "yes", then ask, "But do I still have the idea?" ("yes") "Then you didn't steal anything from me."
But say that you got the invention patented, and then sued me for patent-infringement when I build the machine myself. Have you stolen anything from me now?