That is such a slippery slope, that we'd have to really look at how to keep the information safe guarded.
Printed images, such as stickers and cardbacks, are sooo much easier to fake than manufacturing weapons. Anyone with some patience, skill and knowledge of the print industry can easily fake any of that stuff.
Besides that, the information is out there, you just need to look for it. Or, like what AJ suggested, just ask the question(s). MOC is all about experience really. The more you look at and the more you handle, the easier it is to tell the real ones apart from the fakes.