This summer, I ordered a copy of Mental Acts: Their Content and Their Object by Peter Geach. I was mildly surprised to find that it was a reproduction of the edition published by Routledge, Kegan, and Paul. The back cover said, among other things, that
This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.
I find it odd that the writings of philosophers should somehow reach the public domain so quickly, when Disney's "Steamboat Willy" only made it into the public domain this year. I have made the same complaint of a copied edition of Quine's Word and Object. Disney died in 1966, Quine in 2000, Geach in 2013. Yet somehow Disney' works of the 1930s remain protected, while Quine's and Geach's works of the 1950s and 1960s are not.
The copy of Mental Acts also suggests objections to the attitude of those who think that quick entry to the public domain is wholly beneficial. This week I looked into the book to find its date of publication. The publishers had included a page with a little bit of library information from Osmania University, which must once have owned the copy scanned. But they had omitted whatever portion of the front matter included the publication date. The best I could do from the book was to establish a terminus a quo of 1953, the year of the last-cited publications. Wikipedia says that it appeared in 1957.