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comment ZX Spectrum tape loader: how was copy prevention implemented?
@detly: I found the closest analogy here for Nintendo's Wii and Nintendo GameCube. each disc contains some deliberately placed defects. The exact positions of these defects, which differ for each produced disc, is encoded encrypted in the BCA of each disc. The BCA is readable on most standard DVD-ROM Drives, but consumer burners can reproduce neither the BCA nor the defects.
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comment ZX Spectrum tape loader: how was copy prevention implemented?
I have accepted this answer as it provides the best response to the original question.
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accepted ZX Spectrum tape loader: how was copy prevention implemented?
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comment ZX Spectrum tape loader: how was copy prevention implemented?
+1 for defeat of low-quality consumer-grade tape-to-tape copying, and for attempting to relate the technology to modern IT security. BTW That really is a fantastic website, and it is amazing to see that even 25 years later not all of the encoding schemes have been deduced.
Dec
12
comment ZX Spectrum tape loader: how was copy prevention implemented?
+1 for an informative response, especially for the interesting description of the Macrovision mechanism. However, I can't help feeling that game developers did do something more hi-tech. I seem to recall "accelerated" loaders, not native to the Spectrum ROM, that seemed to defeat copying attempts; though maybe their primary objective was just to speed up the loading.
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12
asked ZX Spectrum tape loader: how was copy prevention implemented?