Copyright law is a very clear restriction on freedom of speech. That's not to argue that it might not be a valid restriction, or justified or something, but I

Copyright law is a very clear restriction on freedom of speech. That's not to argue that it might not be a valid restriction, or justified or something, but I don't really see how it could be argued not to be a restriction of freedom. And it becomes very obvious that if people can share stuff for free, someone somewhere will. That combination of freedom to share speech and ability to do so at 0 marginal cost results in books being shared for no cost.