Add another lesson learned.

enforcement-case-studies.tex

@@ -708,6 +708,15 @@ are both more problematic infractions.  These minor infractions were:
     additional work to ensure functionality on a wide variety of host build
     systems}; this is quite rare.  When in doubt, include the maximum level
   of detail build engineers can provide with the CCS instructions.
+
+\item {\bf Seek to adhere to the spirit of copyleft, not just the letter of
+  the license}.  ThinkPenguin uses encouragement of  users to improve and
+  make their devices better as commercial differentiator.  Copyleft advocates
+  remain baffled why other companies have not realized how large the market for
+  users who seek hackable devices continues to grow.  By going beyond the
+  mere minimal requirements of GPL, companies can immediately reap the
+  benefits in that target market.
+  
 \end{enumerate}
 
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