Originally Posted by Adam
Far from an expert on the subject here, but I think you'll find that data published on any site has a copyright owner and harvesting it without permission of said owner would breach said copyright.
Being accessible from the internet and being in the public domain are different things.
He is right, you can't protect charts or tables as they are not seen as original works and as long as they are presented in a different way anyone can use them once published in the public domain. But threatening people with lawyers has turned me right off the project. I could really see the site being really useful but the approach is all wrong.