AutoCAD 2017 C3D Icons

[ryager]

I just upgrade from C3D 2016 to C3D 2017, everything seems to be working find, except, can someone please tell what the icons with the double yellow line mean.
See attached PDF.
Thanks

[rkmcswain]

As far as I know, that icon indicates that the file has been digitally signed.

I'm going to insert your image here, to save future readers of this thread from having to download and open the PDF file.

[ryager]

Thank you.
"digitally signed"??

[rkmcswain]

Yes, take a look at this for more info.