Limited access method and limited access device

摘要

As for the data stream, it has the contents data which can decode making use of control word. The ECM message which has inside the stream has the control word which is necessary for decoding the adjacent contents data. EMM message in order to decode the contents data from the data stream making use of the control word from ECM message, right has the information of management in order to grant for the stream receiving device which is selected. ECM message it can have the information of further management, at least on one circles. The secure device, when control word is supplied, detects the information of further management, you inspect whether or not information of further management has designated the stream receiving device (12) as the target. In case of affirmation, as for the secure device, the stream in the stream receiving device (12) decoding the part later is disabled at least to perpetual. It makes the target by the condition which with one execution example, as for information of further management, confronts the information of the right grant which is remembered in the secure device and is stipulated. The secure device inspects, whether or not each of them among information of the right grant satisfies this condition, in case of affirmation, disables the supply of effective control word.