Denny - Federal Mogul, at least to my knowledge, currently holds the copyrights which, in this country last 75 years if kept up to date. I always assume that any large company has sufficient attorneys on staff to keep the copyrights up to date.
MOST of the copies posted on the internet violate copyright laws. However, it seems that many of the large companies are currently "looking the other way". Doesn't mean they always will. Look at what happened with some of the downloaded music.
I did acquire a lot of Carter documentation along with some tooling and parts prior to their sale to Federal Mogul.
Jon.