There is a battle brewing in courts that everyone in the photo industry should pay very close attention to. A company called ReDigi (
https://www.redigi.com/) is in the business of allowing anyone to resell “used” digital files. In other words, allowing anyone to sell, for example, an MP3 file they legally purchased. They claim rightful business practice under the first sale doctrine, the same rule that allows you to resell your used books.