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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Starting with the simplest: Capcom Play System 2 (CPS-2) hardware had encrypted code, with the key stored in an ASIC and powered by a battery. When the battery goes, so does the key. Fortunately, it's been thoroughly reverse-engineered and can now have the key restored.
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.
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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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