RPX
Here are posts that explain the activities of RPX. As of 2020, RPX is barely heard of anymore.
RPX: Another Massive Patent Troll?
RPX “Protection Racket”
More Microsoft Patent Trolls, Extortions, and SCO
Microsoft Joins RPX
Patents Roundup: RPX Grows, Netflix Issues a Patent Challenge, More on In Re Bilski
Patent Cartels Galore: RPX IPO, Acacia Moves Racketeering Operation to Texas
New Information About the Gradual Collapse of RPX, a Microsoft-Backed Patent Troll
Patent Trolls Are Going Bust in the United States (Along With the 'Protection' Racket Conglomerates)
RPX Might Soon be Owned by Patent Troll Erich Spangenberg
Unified Patents Says That RPX, Which Might Soon be Owned by Patent Trolls, Paid Patent Trolls Hundreds of Millions of Dollars
Microsoft Has Left RPX, But RPX Now Pays a Microsoft Patent Troll, Intellectual Ventures
RPX, RIP