... but now the sender wants a lot of money. What should I do? Did I really stumble into a multi-thousand dollar problem just by using an image I found on the Internet? I’ve heard of patent trolls. Is this some sort of copyright troll?

This scenario may sound familiar. Businesses have websites. Sometimes images — often photographs — find their way onto the websites without the owner’s permission. If you have received a letter accusing you of copyright infringement and demanding what seems like an exorbitant sum, what are the basic issues of which you should be aware?