20120144192 | METHOD, DEVICE, AND SYSTEM FOR MANAGING PERMISSION INFORMATION - A method, a device, and a system for managing permission information are provided. The method includes: receiving a permission modification instruction, where the permission modification instruction is used to instruct modification of permission information of a file; modifying the permission information according to the permission modification instruction of the file; and sending an Identifier (ID) of the file and the modified permission information to a server. The device includes: a modification module, a processing module, and a first sending module. The system includes: a client and a server. The server and the file jointly store the permission information, thereby effectively improving the flexibility of file encryption, reducing the burden of the server, and improving the performance of the server. | 06-07-2012 |