Firewall patent troll
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Not much for linking techdirt, but it's the only site covering this right now.
https://www.techdirt.com/articles/20150629/15285431493/expired-bogus-patent-basic-computer-firewall-now-being-used-to-shake-down-lots-companies.shtml
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It is a republished EFF story: https://www.eff.org/deeplinks/2015/06/stupid-patent-month-wetro-lan-sues-entire-network-security-industry-expired