No matter how many laws against file sharing there can never be a stop to it. There will always be ways against that.
It is actually quite stupid. Take an example. I have a movie, in essence that movie is just a big sequence of 0s and 1s on my hard drive, those 0s and 1s are just magnetic signals (or not, I don't know how a hard drive really works, xD). So copyright law says that that sequence can't be shared, this is, can't be copied to another hard drive that belongs to another person. So I just change one bit in the sequence and the movie is no longer bound to copyright law, lol.
Or maybe if I change from an .avi file to a .mkv file. he movie is no longer bound to copyright, lol.