carnival73: The concept was passed onto me word of mouth by a few people claiming that the titles were added to the defendant's library by illegitimate means after Steam corrected the 'Key-Sharing Exploit" or legitimately purchased titles were tampered with to grant, otherwise purchased, extra content.
More or less I was warned not to use cracks, hacks or edits with my Steam purchased titles as they could be uncovered via routine checks. I can see how Valve could detect a frequently shared key on their end but don't understand exactly how they would be able to uncover a dummy executable or attempts to tamper with game files without having some way of viewing a user's hard drive if given warrant.
Pheace: This sounds like something that would be checked on startup of the game, not something that happens intermittently. Losing an exploited game makes sense to me. "Tampered to grant otherwise purchased extra content" sounds like a suspicious statement at best. If it's legitimate content it should simply work with the game and be fine, unless perhaps not compatible with the Steam version in some way. Either way it seems unlikely the game would be pulled for that. Sounds more like unlocking DLC that isn't owned legitimately.
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So what you're explaining is that any piracy concerns that Valve would have can easily be uncovered by comparing the users' account purchases to games and DLCs in that user's library therefor actually force-scanning someone's hard drive would not be necessary.
So taking Valve out of the equation -
Leaves us with "The All-Seeing .net Eye" or some hack who has a creepy (and perhaps sexual) interest that prevents them from any activities aside from getting a closer sniff of my rectum.
And, once again - it may just be the drive OR it could be some form of snittery that most don't normally notice taking place in the background because their SATAs compensate for the slow down.