I think it was early this year, that twiggle stix, asked me how a photograph of his got onto some other site. So, here is my 2¢ on how to protect ya 'crown jewels'.
there is no way, no how you can 100% protect anything from piracy online.
That literally means, if you don't want your ish to be jacked, don't publish it --- it's like that thing that celebrities do when they find out their 'consenting adult activity video tape' is cruising the 'informed super (perverted) highway'.
What I have done, is make the 'original' photograph not accessible through the web. That is to say nobody can view the photograph you originally upload
oh btw, by virtue of anything being viewed online means, it has already been downloaded.
what can be seen/viewed
that means, even if they do decide to jack it, they won't be able to get the 'good quality' ish.
And, that's the most I can do from my side --- unless I make the entire site 'blocked and only registered' people can view stuff --- but, that won't be fun.
What you can do is:
I think that should do it. If however you do spot a photograph of yours or anybodies being used elsewhere on the intewebs, without permission, let me know if you have a problem with, (like me I don't really care if my photography is used, for as long as they credit the source: *hint, hint).
I do go through the site logs, every week, to see if anybody is 'jacking' anything --- so I will advise as I find ish.
Word, is bondage.