Protection from Unauthorized Pre-fetching. The Pre-fetching is widely deployed in Multimedia Storage Network Systems between server databases and end users storage disks . That is to say, If a content can be predicted to be requested by the user in future requests, this content will be fetched from the server database to the end user before this user requests it, in order to decrease user response time. Although the Pre-fetching shows its efficiency, the unauthorized pre-fetching should be avoided to make the system to fetch the necessary content.
