Podcasts were made in 2004 by two men named Adam Curry, and Dave Winer.
Adam created a program called iPodder that enabled him to automatically download Internet radio broadcasts to his iPod.
Right now you do not need a license to do a Podcast. Anyone can podcast if they want to.
“By podcasting consistently on one subject, podcasters not only assert their expertise on the subject matter but also draw a loyal and devoted group of listeners”
My DBA Blog 