Interesting that the Wikipedia article for "Copy Protection" says literally nothing about the arcade industry, which had some of the most creative (and abusive) anti-copying methods around.
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CPS-2 was more or less Capcom's attempt at implementing what Sega had managed with Hitachi on the Sega System 16, 18, and 24 boards: The 68000 is potted in an epoxy brick along with decryption circuitry and a coin cell for backup.
It was eventually determined that Sega had used an LCG for generating the sets of keys, which narrowed the search space a bit.
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Beyond pure "copies simply won't run" protection, there were all manner of insidious methods in use. Sega's Quartet, for example, ran on System 16A hardware, but didn't have a Hitachi-encrypted CPU. It used a read-protected Intel i8751 microcontroller instead.
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Among some fairly basic things - display enable/disable, for example - the i8751 MCU controls moving platforms in later stages. No MCU, no moving platforms. This is something only recently fixed in MAME, and which Sega even themselves got wrong in a recent re-release.
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