Why doesn’t the library have unlimited copies of digital books?

If you love reading eBooks and listening to digital audiobooks, this is something you have probably wondered about. Seems like it should be easy, right? Buy 100 digital copies of a book and let everyone borrow them! But it's not that easy. It can be a hard issue to explain for libraries. Publishers of econtent (eBooks and digital audiobooks) have control over how they license their books to libraries and library vendors like OverDrive and RBdigital.