I found this great question on wikipedia that I thought deserved an answer:
If I understand this correctly, this could be used to circumvent the non-commercial clause in certain Creative Common licenses. If person A makes copies and gives them to person B for free, B can sell them for any price he wants, because person B is not a licensee, and he has legally obtained the copies legally made by person A. Is that right? — Sloyment (talk) 05:48, 1