The legal battle over a patent on podcasting continues as Personal Audio LLC say they own the rights to episodic content on the internet. Critics are calling them patent trolls as they’ve already sued Apple, SiriusXM, and settled with comedian and podcaster Adam Carolla. Their next target is CBS. Joe Mullin, Tech Policy Editor for tech news website Ars Technica, explains how this got so far and what it could mean for other companies.