A GPS aggregation assist grouping for providing added GPS rebuke and communication acquisition aggregation to subscribers. A GPS aggregation computer broadcasts GPS aiding aggregation encrypted with subscription keys. A far GPS subscription organisation receives the key enablers for the subscription keys in assist activation (SAM) messages for the services for which they hit subscribed and then uses the subscription keys to rewrite the GPS aiding information. In visit to preclude unlicensed admittance to the information, asymmetric mode procreation and marker algorithms are utilised for generating and authenticating signatures for the SAM messages.

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