Hi Michael - you're up early or very late :)

Thanks for the reply ... speedy as usual

>>It is possible to put in custom chunks of application or plug-in specific data into 3DM files, so it could be possible to store encrypted information into the file that way, but it would be separate from the standard author header field and no other programs that read 3DM files would know how to do anything with that information and would just skip it...<<

That's cool, I will have a natter with the guys at rhino ... It's just for copyright dates and times more than anything, so even the creators name is not that important, but would add a little extra to the evidence side of things should it ever be needed, and as such, third party applications should be leaving it intact or ignoring it anyway so the chain of creation times does not get broken.

Many thanks for your time Michael ...

Martin Spencer-Ford