Ian,

Its not just modern US, I have a book here that I was reading last night that was printed and distributed in 1898 on Darkroom formulation and such the also mentioned copyright issues, so this is not a new thing, as is it is not anywhere in the world, copyright extends a long ways back and in fact, I watched a show on the Rossetta Stone that made a statement about the british sueing the french in 1822 over the ownership of the copyright on the stone, and if anything has historical value it is the Rosetta Stone!

LOL

Dave