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The problem with DRM is that the keys must be revealed to the end user machine and thus susceptible to interception. Not to mention I believe that the Sony PlayStation uses ECDSA to secure its firmware and it got cracked.


lm = nm; low = nw; hm = lm; high = low; You're setting hm = nm since lm = nm. Correct is: hm = lm; lm = nm; high = low; low = nw;

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