加密

jiā mì to encrypt; encryption; to protect with a password

免

wèn old variant of 絻[wen4]

miǎn to excuse sb; to exempt; to remove or dismiss from office; to avoid; to avert; to escape; to be prohibited

用

yòng to use; to employ; to have to; to eat or drink; expense or outlay; usefulness; hence; therefore

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