Copyright permission

My episode with the City of Minneapolis maps illustrates a useful copyright pointer.  You can often get permission to use material that's protected by copyright.  

Thanks to Scooter for catching my illicit use. 

There are statutory damages for copyright infringement of $50,000 per occurrence, so the fact that one doesn't make money off use of infringing material doesn't insulate one from having to pay out.  (It's a factor in determining if a use is "fair", but it's not determinative.)