My grandfather, an academic, wrote several books which were published here in the US by a major publisher, and at least one book published by his university press. All these books have long been out of print. He died in 1974. His last book was published in 1965, I think. His heirs were my mother and my aunt. Both my mother and aunt have been deceased for some years. The surviving heirs are me, my brother, and a daughter of my aunt.
His first book is already in the public domain and has been reprinted. The second one I believe is important for the public to have access to read. It was published in 1933 and renewed in 1961 by my grandfather. There are currently no used copies for sale on Amazon (just to give a general idea of its availability). This was one published by a major publisher.
He had his memoirs published in 1965 by the university press. This book is quite interesting and there are five used copies for sale on Amazon.
I would like to put the 1933 book and the memoirs online for free public access. This would be a non-exclusive use of the copyright, correct? I would also like to be able to publish excerpts in print form, specifically in a local community newspaper.
Do I have the right to do this? Will I need to prove that I do? To whom, under what circumstances? There will be no royalties involved, so I should not be required to notify my co-heirs, is that correct? I would notify my brother, anyway.
The attitudes of my co-heirs, I believe, would be that they have no objection, though if there were money involved, one or both would probably want a cut. Neither of them is in the habit of reading books, even online.
Would either of the publishers be likely to raise any objections? I hope I do not have to contact them, but if I do, what exactly should I ask?