Werner Koch wk@gnupg.org schrieb/wrote:
True, 70 years after the death of the author it is a public good but for practial usage you have to find a copy which has been published
70 years ago.
Not necessarily. A copy which has no modifications (or no modifications that would be protected by copyright[1]) over the old version is sufficient.
Claus
[1] Such as adapting the work to a new spelling.