Nathan Russell wrote:
> I might note that it's impossible to encrypt something so it cannot
> be copied exactly; even now, it is very common for pirate DVD
> manufacturers to simply copy the original disc byte for byte, without
> even needing to crack the encryption.
I guess "grey bits" never caught on. "Grey bits" were a copy-protection
mechanism in which parts of the original media a program is distributed on
were encoded poorly, so that repeated reads of the grey sections would
produce different results. Before running, the program would try to read
the grey section until something came up different.
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