The Tyranny of Copyright?

Selected quotes from the NYT article by Robert Boynton.

...They see themselves as fighting for a traditional understanding of intellectual property in the face of a radical effort to turn copyright law into a tool for hoarding ideas. "The notion that intellectual property rights should never expire, and works never enter the public domain -- this is the truly fanatical and unconstitutional position," says Jonathan Zittrain....

...[Benkler] notes that each major innovation in the history of communications -- the printing press, radio, telephone -- was followed by a brief period of openness before the rules of its usage were determined and alternatives eliminated. "The Internet is in that space right now...."

My question is why label them Copy Left when they are rooted in traditional and strict constitutional notions of COPY RIGHT?

Comment on the article here.

See also: Public Domain Needs Your Help [EFF] | DMCA v. Public Use: Are Constitutional Safeguards Insufficient in an Era of Industry Lobbying [pdf]