anyone can remove a watermark depending where it's located on the image. they can download a 900px ver of the image. beyond that they never mentioned what they do for security or what they plan to do with this new stock venture, and will my files be mixed in with that.
usually you'll have lots of views and few sales, people like looking. either someone in russia likes your work, or they are a bot. there is no 100% effective ways to prevent theft other than to not have it there. the chances at someone wanting to break into the site and steal images - rather than credit card info - is rather remote i think.
i don't care for watermarks and even if it was there, it won't help people find me if they found it.
---Mike Savad