Awesome, thanks guys. That was a lot of help!

Okay, so I have a band, and I've recently had a designer create a logo for us. After some investigation into the font he used and asking him about his purchasing of the rights, he said it was a "free for personal use" font and he had not purchased the rights, though he had originally claimed everything was taken care of in the initial payment. That being said, now our logo is in and around several locations in cities, YouTube, Facebook, etc. without the rights being paid for. According to some of the forums I've read, this isn't an issue because we aren't advertising anything such as an album or a product, only shows. Would I be safe in assuming that I should just buy the rights if I'm going to continue using this logo? Thanks!