Frederic,

Perhaps there's another service here...one where users can 'test' each others scenes. ;-)
It would be nice if there were some sort of Python call to check for copy protected stuff, then a plugin could be created to identify them.

BTW, aren't just about all the SolidGrowth plants copy-protected? If so, does that mean any scenes with custom eco-systems are bound to fail?

IMO, you really need to address this issue before people can really use your system. The 'issue' being how to identify whether or not a scene has copy-protected stuff in it which won't render on the Renderfarm.