Thank you for your reply. I appreciate it. I hope Apple takes note: if they want us to use their Photo program more professionally and thereby compete with the more complicated but option-laden Lightroom, then options such as a simple copyright should be added.
While I do not wish to watermark, if that's the only answer to preserve source, I can do that in some cases. Thanks for the app. I'll go look at it.
My other question involves the same Info panel - if I put in a description or a keyword (I had been trying to put copyright information here because they are the only slots), that desc. or keyword, too, does not transmit with the exported photo.
I have used Album to change, one by one, the label on a group of photos and those labels hold while in Album format. But again, on export, these changed labels disappear.
Modifying the EXIF is worth exploring.
Also, can you batch change EXIF, Info or image labels within Photos?
Thanks for any more enlightenment you send my way! Much appreciated.