I just read the following disclaimer on a website that had screenplays for a fair number of movies:
All material published here was copied off the net, and therefore the curators are not liable to any copyright infringements or anything like that. Virtually all can be just links to somewhere off the internet.
It doesn’t matter where the material is obtained from. If you publish copyrighted material, it’s infringement unless you have permission from the copyright owner or it’s published under the fair use provisions of copyright law.
The idea that “I found it on the internet so it must be OK to use since someone else already put it there” is just plain wrong. It’s a myth that publishing something on the internet changes the copyright rules. All the internet does is make it easier to break the rules.
One of the exclusive rights of authors — or whoever else owns the copyright — is to distribute copies to the public… by whatever means. Publishing copyrighted material on line is an infringement of this exclusive right.
More copyright related information is available at Copy Right, Copy Sense.