Abstract: A document management system enables multiple users to collaboratively contribute to the contents of a document via any suitable medium for transporting and storing documents, including email, shared drives, replicated work spaces and centralized storage systems. A tracking strategy is employed, in lieu of a central repository, that is based upon medium-independent versioning. Each version of a document that is created and saved by a user is given a unique identifier. The versions are submitted to a global service for ratification as the next authoritative version of a document. A submitted version that forms the next step in a linear sequence is ratified as the authoritative version of the document, whereas the version which does not meet this criterion becomes identified as a new document. Support is provided for users who create versions off-line, as well as users who are not subscribers to the system.

Abstract: A stream of time-ordered data, such as a movie, is divided into multiple fragments of equal length, which are repetitively transmitted at different respective repetition rates. The fragments are reordered for transmission so that those which occur near the beginning of the original data stream are transmitted more frequently than those which occur later in the data stream. When a user enters a request to utilize the data, the individual fragments are stored upon receipt at the user's premises, and reassembled into a contiguous stream. The ordering of the fragments is such that the wait time required before utilization of the data can begin is limited to a predetermined maximum, and at least one copy of every fragment becomes available by the time it is needed.