Method and apparatus for acquiring the domain information and the data relation to the domain for protecting content

A method and a device for obtaining domain information and domain-related data for protecting contents are provided to change the contents inputted to a home domain from the outside into the contents following a DRM(Digital Rights Management) system and obtain the latest domain information and an updated domain key needed for generating the license to protect the contents used in the home domain. An importing module(1100) receives domain information including a domain key ID. A DRM client module(1200) receives the domain key updated to be available in the domain. The importing module includes the first import receiver(1120) receiving the domain information from a domain information provider(2000) and the second import receiver(1140) receiving the updated domain key from the DRM client module. The DRM client module includes a discriminator discriminating whether the held domain key requires update, a requestor requesting the provider to update the domain key, a receiver receiving the updated domain key from the provider, and an adjacency checker checking adjacency from the provider. If the provider is adjacent, the receiver receives the updated domain key from the provider.