Abstract: The system provides a method and apparatus for writing a unique copy of data associated with each of a plurality of individual users, without the need for storing duplicate copies of the entire data file. The system provides for creating an unusable copy of a portion of the data that is to be shared by all users of the complete data. The system will store and optionally encrypt and/or watermark a unique copy of the remainder portion of the data for each unique user. When accessed from storage, the system will combine the shared portion with the unique remainder to reconstitute the entire file for access by the user. Deleting the unique remainder associated with a particular user makes all of the data useless to that user. In one embodiment, the system first compresses the entire data file using index frames and delta.

Abstract: The system provides a method and apparatus for writing a unique copy of data associated with each of a plurality of individual users, without the need for storing duplicate copies of the entire data file. The system provides for creating an unusable copy of a portion of the data that is to be shared by all users of the complete data. The system will store and optionally encrypt and/or watermark a unique copy of the remainder portion of the data for each unique user. When accessed from storage, the system will combine the shared portion with the unique remainder to reconstitute the entire file for access by the user. Deleting the unique remainder associated with a particular user makes all of the data useless to that user. In one embodiment, the system first compresses the entire data file using index frames and delta.