In order to prevent enterprise data files from being copied and transmitted to the outside of the company at will. Therefore, there are various leak-proof technologies (no USB flash drive, no network disk, no QQ, no internet access, and even direct disconnection), but these technologies are more or less flawed no matter how they are solved. It will bring a lot of inconvenience to prohibit copying files by USB flash drive; It is said that there is no feasible operation method to completely ban all network disks. Banning QQ and surfing the Internet cannot fundamentally solve this problem. The beep of file transfer. The file encryption software is simple and crude, which directly gives users a solution: according to different types of files, automatically encrypted and encrypted files run normally inside the enterprise, and any private copy of files sent outside the enterprise cannot be opened and used. It can be said that the file transfer channel has been cut off.