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Politics : View from the Center and Left -- Ignore unavailable to you. Want to Upgrade?

To: cosmicforce who wrote (377636)	7/20/2018 2:35:42 PM
From: Sun Tzu	Respond to of 543106

DRM relies on being able to read something that the consumer cannot write. This is fundamentally a weakly posed problem and is very hard to achieve. As I said in a previous post, the state of the art software DRM in the '80s was having sectors with "weak bits" which were written in the threshold between 0 and 1. When you read those sectors, sometimes they read as 1 and other times as zero. The DRM relied on reading the sector several times - if the values remained constant, then it was a pirated copy. Consumer drives could not write weak bits; they wrote either 1s or 0s. But you could defeat this scheme by rapidly turning the write head on/off over the sector and allowing the magnetic residue imprint on the disk. Thereby allowing a consumer drive to do what the producers believed only the expensive production system could write.