As I was writing my post on Understanding Fair Use, I realized that not only do few people understand it, it often gets confused with First Sale, an entirely different but even more essential component of copyright law, especially for libraries. I say this because that’s what my brain did. I mushed the two together. So, I thought it only prudent to clarify, if only for myself, the finer points of the First Sale Doctrine and why it is so important to libraries, not to mention used booksellers, both physical stores and digital providers (think Amazon Marketplace or eBay). But this post will just focus on libraries.