To claim as one's own. Big corporations normally do it so people don't steal their ideas. Then, as soon as somebody does in the slightest way, they jump on the opportunity and sue their ass for an unreasonable sum of money.
Bob: Hey, I should invent that...
Bill: No, you can't, Big corporation (c) already took it.
An abuse of power regarding who gets the highest share of a royalty; pseudonym for laws designed to consolidate information access, usually in an attempt to disenfranchise those who would need the access the most.
The music industry self-servingly calls for strong copyright enforcement.