Now a lot of companies have encryption software, leave the LAN is can't open the file,
Cracking is very simple, actually principle is to use to open the file as plain text (if it is not clear that will not work), do a software, open the file, and then using the method of data stream transmission to other places (or USB storage class, through the network can disguise streaming media, must custom formatting of pure data flow, can't transfer files), both ends to form a complete set of software is ok,