Patent ID: 8254575
Filing Date: 2012-08-28
Classification: H04H,H04N

Abstract:
1. A method for the managing group messages for at least one receiver comprising a security module, the security module comprising an identification address, this method being carried out by a management center and comprising the steps of: a. defining a maximum length for a group message; b. defining a group command for a plurality of security modules; c. forming a group message comprising at least the group command; d. adding a starting address and a range to the group message; e. determining a remaining length in the group message, the remaining length being a length in the group message that would remain available after steps c and d are performed; f. defining a bitmap of variable length; g. setting the identification address equal to the starting address and initializing an index value and the length of the bitmap; h. updating the bit of the bitmap for the security module pertaining to the identification address to activate/deactivate the command for said security module; i. compressing the bitmap; j. determining whether a length of the compressed bitmap is smaller than or equal to the remaining length in the group message and, if the length of the compressed bitmap is smaller than or equal to the remaining length in the group message, updating the index value, the length of the bitmap and the identification address and re-executing the steps h to j; k. updating the range in the group message based on the index value and updating the group message with the compressed bitmap having the largest length able to fit in the remaining length.