To prevent people from writing to this file, Apple protects it with a checksum hash which has to be reverse-engineered.
为了防止人们在该文件写入内容，苹果用校验和散列（checksum hash）函数对其进了加密。
To prevent people from writing to this file, Apple protects it with a checksum hash which has to be reverse-engineered.
为了防止人们在该文件写入内容，苹果用校验和散列（checksum hash）函数对其进了加密。
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