More on the IP/copyright argument from Lawrence Lessig:

O'Reilly Network: Free Culture: Lawrence Lessig Keynote from OSCON 2002 [Aug. 15, 2002]
Creativity and innovation always builds on the past.
The past always tries to control the creativity that builds upon it.
Free societies enable the future by limiting this power of the past.
Ours is less and less a free society.