With the substantial limitation that the source must be "legal", i.e. you can't copy something from a torrent for example since it is likely the uploader didn't put it here legally.
I'm not even sure the sources must be authorised to publish the works for you to be able to copy it from them without legal repercussion. Our Hadopi law doesn't punish download, it punishes upload (more precisely, the fact that someone uploaded something from your network). Definitely not a lawyer, though.
