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Bozo bit
The term bozo bit has been used in two contexts. Initially a weak copy protection system in the 1980s Apple Macintosh Operating System, the term "flipping the bozo bit" was later reused to describe a decision to ignore a person's input. It is a whimsical term, possibly derived from the classic children's comedy character, Bozo the Clown.
==Weak copy protection==
In early versions of Apple's Macintosh Operating System, the "bozo bit" was one of the flags in the Finder Information Record (also called the "no copy" flag in some documentation), which described various file attributes. When the bit was set, the file could not be copied. It was called the bozo bit because it was copy protection so weak that only a bozo would think of it, and only a bozo would be deterred by it. After Mac System 4, introduced in early 1987, the Finder ignored this bit.
The cassette and ROM filing systems and the Advanced Disc Filing System of Acorn MOS feature a rudimentary copy protection mechanism where a file with a certain flag set cannot be loaded except to execute it.
The Compact Disc has a similar "no copy" bit in the subcode, but nearly all disc-copying software ignores it, and usually removes it on copies. Consumer-grade dedicated hardware audio disc copiers usually honor the bozo bit, and will refuse to copy a disc with the bit set. Professional disc copiers ignore the bozo bit and will copy a protected disc.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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