I believe one of our users downloaded a file that was created with a SolidWorks Educational license.  I recall seeing a macro on the forums awhile back that would identify any files in an assembly that were created with SolidWorks Educational version (rather than scrolling through the tree looking for a grad cap icon).  I'm unable to locate the macro.   I found a post on the site below stating knowledge base solution S-040508 contains a macro for this, but S-040508 doesn't exist !?

http://www.javelin-tech.com/blog/2015/07/watermark-indicates-solidworks-files-educational-version/