Their description of how people could use 3d printers talks a lot about &quot;sharing&quot; of CAD files but their enforcement conclusion talks about &quot;selling&quot; 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.<p>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&#x27;s much less of a paper trail.