This subject doesn't seem to go away.
I thought this was a commuinity where we each uploaded images for the purpose of allowing others to view our postings and download them for their own use if they wanted to. No need for permission, that's just the way a community works.
In return we can download photos posted by others - it's called sharing.
Defacing photos with a watermark negates the whole concept of this site and like Fred I would be reluctant to bother posting photos if the images I uploaded were essentially ruined without my permission.
The film industry, musicians and software companies are losing millions of dollars through piracy, somehow the potential loss through someone stealing a couple of my photos seems rather insignificant, but then I never took any photos with a view to making money out of them.
Tony