I agree with Dave. There's a very difficult balance to be found between protecting legitimate rights and maintaining rights to free speech.

One of the negative effects of the internet is to create an environment where people seem to think it's acceptable to take things without paying for them, and to say or write things without the need for justification or evidence. This is now seen as normal behaviour - a recent TV ad here for a respectable internet provider showed a family using their broadband, finishing with one of them downloading music and instantly sharing it with friends. People feel free to make comments on Twitter which would see them in court if printed in a newspaper.

Whilst some sort of control over this is perhaps needed, it seems almost impossible to find a way of doing this which doesn't do more damage than it prevents.