Time-window-constrained multicast for future delivery multicast

Details Time-window-constrained multicast for future delivery multicast Time-window-constrained multicast for future delivery multicast

H - Electricity

04

L

H04L 9/12 (2006.01) H04L 9/08 (2006.01) H04L 12/16 (2006.01)

Patent

CA 2422153

To provide a fairness of distribution, an encrypted event, containing information not intended for release prior to a release time, can be sent to clients prior to the release time. In such a manner the bulk of the information can be transferred to the clients without concern to the duration of the transfer. At the release time, a small decryption key can be sent, either from a central sever, or from multiple server, utilizing multiple network paths to provide for the greatest likelihood that each client will receive the decryption key with a minimum of delay. Each client is thereby provided access to the information at approximately the same time, regardless of the bandwidth available to each client. Additionally, trusted edge servers, that can be trusted not to release information prior to an appropriate time, can send an unencrypted event, or decrypt the encrypted event and send the decrypted event, at a determined time, either prior to or after the release time, such that the decrypted or unencrypted event arrives at the clients that could not store and decrypt the encrypted event at approximately the same time as the key arrives at the other clients. Each client can thus receive the information at approximately the same time, regardless of the client's bandwidth or its ability to store and decrypt information.

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