Well i got a reply back from Brian @ McNeels and apparantly there is a Watermark feature in the open 3DM format

>> There are two command you could look at... 'ApplyWatermark' and 'FindWatermark' but they're not a guarantee that someone won't distribute your file.<<

@ Michael - Is there any way you can implement this feature within MoI ?

I had no idea it was there already!

Martin Spencer-Ford