Hi Martin, there are some general fields in the 3DM file for author - I've recently blanked those out for 3DM files that MoI writes out though, because a different user complained about the exact opposite, that their Windows user name was embedded in the file without them wanting it to be.

But if you open up the 3DM file in Rhino, you can then in Rhino start a new file, then import your 3DM file from MoI and save it out, and it will then contain your Windows user name in the author section of the 3DM file.

It's very easy though for someone to remove the author field using various ways, just exporting it to some other format like STEP and reloading it again or something like that would not round trip the author field. It's not really something that you can rely on to be a secure mechanism.

It's very difficult to make a secure mechanism while at the same time being able to share your geometry for general use with others, those things are basically inherently at odds with one another. In order to make a secure mechanism you would need to distribute the model using some kind of special file format that only one specialized reader application would be able to read rather than in a general file format that is specifically oriented towards full interoperable sharing of the geometry.

- Michael