Update read me. Added comment about products that have a patent.

agharasoul · Aug 30, 2013 · a447e76 · a447e76
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 ==========================
 Marlin 3D Printer Firmware
 ==========================
+Marlin has a GPL license because I believe in open development.
+Please do not use this code in products (3D printers, CNC etc) that are closed source or are crippled by a patent.
 
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