FWIW, if you've got a Nikon DSLR (or mirrorless) there's a setting (in 'settings' - varies from camera to camera) in which you can set your copyright and contact info. Entering text is varying levels of PITA, but once it's there, it's in all the output from that camera.

That said, I've done this, but don't really care if other people find a use for my stuff as I'm doing it for my own satisfaction. A simple credit would be nice...