FormFonts has a number of such identifiers. All the models are made using a specific template which automatically claims copyright. That can be ircumvented by merely copying the mesh to another file, though’
The default layer and all the materials are unique to the business, with company-specific names. We even hide a little edges-only component of the company logo somewhere on the model for use as a “smoking gun”. It’s hard to claim that you made that model of an automobile when not only are all the vertices identical, but when you’ve got all that other uniqueness and a company FF logo hiding behind the number plate, under the dashboard or even in a wheel-nut.
It doesn’t seem to matter to the “Everything should be free” brigade, though. Ruby encryption of function may be the answer in the case of a DC
The present business model is by subscription, so not really relevant. But my original CD of the first decent 3D people for SketchUp (decent in the sense that they were only about 2,500 faces…unlike imported Poser stuff, which crashed the program) retailed at about $1 each. It was a collection of about 135 people which sold for about the same number of dollars Work wise, it took me about 6 months…more or less 1 figure per day. I hope that’s of some help as a general guide.
Selling stuff from your own website can be a little tricky too. People expect digital content to be available immediately, by download. Mine was too, but there are always people who don’t read the instructions properly, so i often came back from a weekend away…or a 2 week vacation to the odd, irate email.
You also have to set it up so that the download page can only be accessed from (for instance) the PayPal confirmation of payment page, or whatever. Otherwise, if it can merely be pasted into the address bar of a browser, you’re going to have people passing around the URL and bleeding you dry.