http://feedproxy.google.com/~r/PatentlyO/~3/_yak_gT6mMo/resale-prevent-arbitrage.html
Patent – Patently-O 01/31/2017
http://feedproxy.google.com/~r/PatentlyO/~3/aRz4VC31DjY/patentlyo-bits-and-bytes-anthony-mccain-30.html