contributory infringement:  not making, selling, using, but the thing they are making could be substantially used to infringe!???
-    If you are on notice that you might be infringing, you have an absolute duty to seek competent legal advice!
-    if you don’t get legal advice = willful infringement (treble damages)
-    get an opinion only from someone competent and experienced and unbiased to examine everything
-    ex.  I make ABC; competitor makes ABCD.  They are infringing b/c everything in my patent is in theirs.