Patent ID: 6473742
Filing Date: 2002-10-29
Classification: H04L,H04N

Abstract:
Apparatus for receiving broadcast transmissions, which transmissions contain identifiers identifying the origin of the transmission, the apparatus including:a store for storing data identifying transmissions which the apparatus is or is not permitted to receive; means for loading the store with such data; and means for comparing received identifiers with the contents of the store and to enable or disable reception in dependence on the result of the comparison; wherein the apparatus has a fixed part and a removable part; wherein the removable part contains a further store containing the said data; the loading means being operable to transfer the contents of the further store into the first-mentioned store; and wherein each of the fixed and removable parts has means storing a verification number (X) and the loading means is operable to perform the transfer only after a verification step indicating that the verification numbers tally.