Here's an analogy people can take issue with if they wish . . .

In the days before digital versions of books. A publisher secures the rights to publish an authors work, goes through the typesetting process, and prints a run of the book. A person purchases one of these books and using it as the source of the content purchases a printing press and prints out copies of the same book which this person then sells or gives away for free.

Fast forward to digital content. A person buys an e-book and then sells copies of the digital file or gives copies away for free.

There is, in my opinion, no legal or moral difference between the two. Both cases violate the copyright protection of the author and publisher. It is not the legal or moral impediment that has disappeared with digital content, it is just the practical constraints. The bottom line is that law and custom does need to catch up with technology.

Oh, and I think also that use of the term “used” does create unnecessary confusion. I would suggest taking a page for car dealers and refer to it as pre-owned.