Their description of how people could use 3d printers talks a lot about "sharing" of CAD files but their enforcement conclusion talks about "selling" of CAD fil

Their description of how people could use 3d printers talks a lot about "sharing" of CAD files but their enforcement conclusion talks about "selling" of CAD files. Sharing and selling are very different, selling is very easy to track while sharing (as shown by things like enforcement of bittorrent copyright infringement enforcement) is a bit harder. I could easily see that selling a CAD file which infringes on a patent could be enforceable. In theory, also sharing of a CAD file which infringes could be enforceable but it would be much harder to do so as there's much less of a paper trail.