I have some old family photos from the 19th century, well out of copyright. As far as I know, are the only remaining copies. An author has asked for permission to use some of the photos for a book he is writing. I don't mind him using the pictures for the book, and I don't want any compensation. But can I still ask him for an agreement not to use the photos for any other purpose? They aren't copyright any more, but they are mine, and I don't want them being used for other purposes without prior permission. I see that archives at museums and universities often require users to sign an agreement limiting further distribution of their content. Could I do the same thing (no, I'm not on the business of selling photos!)?
Thanks!