TORONTO - CBC is cracking down on podcast app-makers, claiming that making an app that pulls down public RSS feeds is a "commercial use" and therefore a violation of its copyrights.According to a post on Boing Boing, the public broadcaster has taken the stance that making a tool that allows someone to load a public URL without permission is a violation of copyright law.“It is an absolutely insane idea, and as legally ignorant as one can imagine”, reads the post. “It's shocking that a letter of such dangerous stupidity was sent on CBC letterhead, signed by someone who apparently got a...