Patent ID: 7594254

Claim:
A method for transporting files from a cable headend, comprising: for each of the files: transforming a file identifier of the file into a respective data identifier (DID): determining a packet identifier (PID) based on the DID, wherein the PID is associated with a communications channel selected to transport said file; determining a first identifier based on the DID; and transmitting, from the headend via the communications channel, one or more packets associated with the file, each of the one or more packets including the PID and the first identifier, wherein said first identifier is adapted to enable receivers of said communications channel to selectively receive one or more packets associated with the file among packets transported via the communications channel; wherein, for each of the files, the determining the first identifier based on the DID further comprises: dividing the DID into at least two portions; and performing one of: performing an XOR operation on two of the at least two portions to determine the first identifier; or concatenating at least two of the at least two portions to determine the first identifier.