Sure enough, internet audio shows were alive and kicking as far back as the early '90s. But that didn't stop Personal Audio from filing for a patent that effectively covered all podcasts made after 1996. Upon receiving it in 2012, the company began demanding licensing money from big-name podcasters, such as Adam Carolla, and CNN. By 2014 -- the year in which it won a lawsuit against CBS -- its podcasting patent had become the scourge of the industry.

Then, in 2015, came a legal breakthrough: US patent officials dealt Personal Audio its first blow by quashing some of the core claims of its patent. With the federal appeals court upholding that decision, the company's future legal campaigns don't stand a chance. Now, the only option left for Personal Audio is to ask the Supreme Court to hear the case. Even then, it could still find it extremely difficult to hound podcasters for dough. Therefore, you can stay safe in the knowledge that the likes of Stuff You Should Know and This American Life won't be cut short by a nefarious troll.