The law is probably similar, but the technological ability to restrict access is not. Youtube allows you to stream only, not download. That makes it easier to

The law is probably similar, but the technological ability to restrict access is not. Youtube allows you to stream only, not download. That makes it easier to get license holders on board. (Yes, there are workarounds for that, but most users won't bother to go to the trouble, and the quality of the download would be degraded from a purchased copy.) With books, there's no easy way to limit access like that while providing a usable service.