Key providing method, video playing method, server and client

The present application discloses a key providing method, a video playing method, a server and a client, in which the video playing method includes: sending a download request to the server and receiving an index file of a target video data delivered by the server; constructing an access request based on a specified string in the index file, and sending the access request to the server to acquire from the server a preset key which the access request is directed to; sending to the server a file acquisition request including a file address to acquire from the server encrypted fragmented data which the file address of the fragmented data is directed to; decrypting the acquired encrypted fragmented data by using the preset key, and playing the decrypted fragmented data. The technical solutions provided in the present application can effectively protect copyrights of video data.