https://www.techdirt.com/articles/20170819/11432838038/this-week-techdirt-history-august-13th-19th.shtml >Five Years Ago >This week in 2012, while Amazon was realizing it had little choice but to get in on the patent portfolio buying game, Google was launching a prior art finder to help stop bad patents — though some worried it might be used by trolls to find targets. Meanwhile, Google also made the controversial decision to start filtering searches based on DMCA notices received by the site, but of course even this wasn't enough to satisfy the RIAA and MPAA.