Dee Flint wrote:

...
Here's a site that summarizes if documents are still under copyright or not.

http://www.copyright.cornell.edu/tra...lic_Domain.htm

Basically if the work was published in 1923 or later, there is a potential
for it to be still under copyright. Copyright laws have changed a lot.

Dee, N8UZE



Dee:

I believe I was the first one here to point out the limitations of
copyright laws, and how Disney paid certain representatives of ours to
lengthen these laws to protect works which were still generating
substantial income ...

Google is publishing many works which are expired as is the gutenberg
project ...

But, in a nutshell, that rule above, you state, is a good "rule of thumb."

Regards,
JS