I think it's fairly unreasonable for any artist to expect no viewers will download their images from a website for private viewing, when they publish to the internet.  There's no way to enforce this "rule", unless you put in place some "scripted" deterrant that prevents right-click function, and then have any unauthorized downloads somehow tracked to a database, along with the member's IP address (which could then turn into a privacy controversy).  It's possible to code simple javascript calls to prevent right-clicking on any given HTML page, so if Rosity felt that was something they wanted to do to "protect" artistic copyrights by discouraging right-click "save as" downloading in javascript-enabled browsers, then it could easily do it.  However, I think it's just silly.

If you post to the internet, expect your work to be downloaded for offline viewing.  Redistribution is another issue, and I'm opposed to that of course.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.