A classic, with illustrations.

A much better analogy for digital piracy is sneaking into a theater to watch a movie.  You are not stealing a copy of that movie, and the theater is free to show the movie to others.  But you are stealing revenue that the theater would have earned had you rightfully purchased a ticket.

So when you pirate music, video or software, you are stealing income from the seller.  You are receiving something of value without paying for it.

READ THE FULL POST AT DEVTOPICS:
http://www.devtopics.com/no-silly-piracy-is-theft/