Abstract: A method of controlling access to content comprises receiving, at a domain gateway (3) of a domain (4), a request from a device (5) in the domain for access to the content. It is determined at the domain gateway whether the number of devices in the domain currently accessing the content is equal to a specified maximum number of devices that may simultaneously access the content. The maximum number of devices that may simultaneously access the content is independent of the number of devices in the domain. If the determination is that the number of devices in the domain currently accessing the content is less than the specified maximum number the request is allowed, otherwise it is refused.

Abstract: A method of key management in a communication network that includes a plurality of groups with each group including one or several members authorized to have access to key-protected services is provided by an apparatus. The method includes determining when a member starts a switching action from one service to another. A time dependent quantity starting from the switching action is determined. The method includes determining that the member is a member of a switching group when the quantity is less than a threshold value is made, and when the quantity is larger than the threshold, determining that the member has decided to join a new group, and changing the appropriate access key(s).

Abstract: The present invention relates to a method of key management and to an apparatus (200) of communication network (100) comprising a plurality of groups (141, 142, 143), each group (141) including one or several members (132A, 132B, 132C) authorized to have access to key-protected services provided by the apparatus. According to the method, it is determined when a member (132A) starts a switching action from one service to another and it is determined a time dependent quantity starting from the switching action. The method further comprises, determining that the member (132A) is a member of a switching group (150) when the quantity is less than a threshold value, and when the quantity is larger than the threshold, determining that the member (132A) has decided to join a new group (142), and changing the appropriate access key(s).

Abstract: A method of controlling access to content comprises receiving, at a domain gateway (3) of a domain (4), a request from a device (5) in the domain for access to the content. It is determined at the domain gateway whether the number of devices in the domain currently accessing the content is equal to a specified maximum number of devices that may simultaneously access the content. The maximum number of devices that may simultaneously access the content is independent of the number of devices in the domain. If the determination is that the number of devices in the domain currently accessing the content is less than the specified maximum number the request is allowed, otherwise it is refused.