A recent CBC Radio Ideas feature entitled "Who owns Ideas?" discusses the progression of intellectual property law and specifically copyright law. The host describes a tension in copyright law that has become known as the copyfight, and it's ultimately a dispute about who owns ideas.
CBC has posted a free streaming audio of the show here.
I practice Canadian patent and copyright law with hi-tech subject matter. This is a web log of personal interests, and should not be taken as professional legal advice. This is not the view of my employer and again is personal. Thanks.