I have heard both Socialists and Capitalists defend it.

Some Caps say that $0 is the natural market value of information without [legally enforced] barriers to access.

Some Socs say that intellectual property, especially in the way that modern corporations throttle their respective industries, cannot be justified any more than other forms of property.

Things to consider: The History of Record Labels, Youtube DMCA Abuse, Disney Copyright Extensions, Pharmaceutical Patents, Patent Trolls, Copyfraud, Linux, Digital Piracy

What do you think?

EDIT: Seems most of the replies vote Left-Wing by association rather than any explicit character of the policy.