[falcolas]

That's my concern as well. You can trace inspirations back throughout history. Paintings, music, writing - all benefit from previous works.

What happens in the print world when a the idea of a "revenge fantasy" becomes copyrightable? When the use of certain chord progressions can cost you the revenue from a particular song? When a movie containing "triumph in the face of adversity through superhuman powers" can't be done because someone else did it first?