Abstract: Provided are a digital rights management (DRM) method and apparatus, and more particularly, a DRM method and apparatus which can support different DRMs and use various digital content. The DRM method includes receiving a hello message request from a host device; comparing information included in the hello message request to information stored in advance; generating an error code when the hello message request contains unsupported information; and generating a hello message response that contains the error code.

Abstract: A digital rights management method and device are provided. To implement the DRM method and device, there is provided a master device including a storage module which stores a plurality of rights objects (ROs) having an inheritance structure, a detection module which detects the storage module for an RO needed for playing back a predetermined content object, a message generation module which, if the detection module fails to discover the RO needed for playing back the predetermined content object from the storage module, generates an RO request message, a device interface module which transmits the RO request message to a slave device and receives the RO needed for playing back the predetermined content object from the slave device, and a playback module which plays back the predetermined content object using at least one of the RO detected from the storage module and the RO received from the slave device.

Abstract: A host device and a method of implementing Digital Rights Management (DRM) systems in a low-efficiency storage device are provided. The host device includes a plurality of DRM systems and a DRM system-shared interface module. The DRM systems provide pieces of DRM-related data and data identifiers (IDs) which identify the pieces of data. The DRM system-shared interface module adds DRM system IDs, which are used to identify the DRM systems, to the pieces of data and the data IDs, and provides results, which are obtained by adding the DRM system IDs, to a low-efficiency storage device.

Abstract: A method and apparatus for implementing a secure clock having no internal power source are disclosed. The apparatus accesses a host device having an internal power source and transmits and receives data. The apparatus includes a clock control unit, a counter, and a time information unit. The clock control unit performs control such that the time information of the host device is acquired and a counter value corresponding to the acquired time information is set, when the clock control unit is connected to the host device and is supplied with power from the host device. The counter changes the set counter value in steps of a predetermined value at regular time intervals while the power is supplied. The time information unit updates current time information to correspond to the changed counter value while the power is supplied.

Abstract: An apparatus and method for managing a plurality of certificates are provided. The apparatus for managing a plurality of certificates includes a plurality of certificates, a certificate search table, a low-performance file system, and a verification module. The certificate search table includes information about the plurality of certificates. The low-performance file system extracts a corresponding certificate from among the plurality of certificates that are received from a host device, with reference to the certificate search table based on a root certificate authority ID and information about a public key of a certificate of a certificate authority that issued the host device certificate. The verification module uses the extracted certificate to verify the host device certificate.

Abstract: Provided are a digital rights management (DRM) method and apparatus, and more particularly, a DRM method and apparatus which can support different DRMs and use various digital content. The DRM method includes receiving a hello message request from a host device; comparing information included in the hello message request to information stored in advance; generating an error code when the hello message request contains unsupported information; and generating a hello message response that contains the error code.

Abstract: A host device and a method of implementing Digital Rights Management (DRM) systems in a low-efficiency storage device are provided. The host device includes a plurality of DRM systems and a DRM system-shared interface module. The DRM systems provide pieces of DRM-related data and data identifiers (IDs) which identify the pieces of data. The DRM system-shared interface module adds DRM system IDs, which are used to identify the DRM systems, to the pieces of data and the data IDs, and provides results, which are obtained by adding the DRM system IDs, to a low-efficiency storage device.

Abstract: A method and apparatus for implementing a secure clock having no internal power source are disclosed. The apparatus accesses a host device having an internal power source and transmits and receives data. The apparatus includes a clock control unit, a counter, and a time information unit. The clock control unit performs control such that the time information of the host device is acquired and a counter value corresponding to the acquired time information is set, when the clock control unit is connected to the host device and is supplied with power from the host device. The counter changes the set counter value in steps of a predetermined value at regular time intervals while the power is supplied. The time information unit updates current time information to correspond to the changed counter value while the power is supplied.

Abstract: An apparatus and method for managing a plurality of certificates are provided. The apparatus for managing a plurality of certificates includes a plurality of certificates, a certificate search table, a low-performance file system, and a verification module. The certificate search table includes information about the plurality of certificates. The low-performance file system extracts a corresponding certificate from among the plurality of certificates that are received from a host device, with reference to the certificate search table based on a root certificate authority ID and information about a public key of a certificate of a certificate authority that issued the host device certificate. The verification module uses the extracted certificate to verify the host device certificate.

Abstract: A method and apparatus of supporting multi-object transport protocols are provided. The method includes generating a first request message based on a first object transport protocol by request of an application; translating the first request message into a second request message based on a second object transport protocol supported by a slave device; and transporting the second request message to the slave device.

Abstract: A digital rights management method and device are provided. To implement the DRM method and device, there is provided a master device including a storage module which stores a plurality of rights objects (ROs) having an inheritance structure, a detection module which detects the storage module for an RO needed for playing back a predetermined content object, a message generation module which, if the detection module fails to discover the RO needed for playing back the predetermined content object from the storage module, generates an RO request message, a device interface module which transmits the RO request message to a slave device and receives the RO needed for playing back the predetermined content object from the slave device, and a playback module which plays back the predetermined content object using at least one of the RO detected from the storage module and the RO received from the slave device.

Abstract: A digital rights management (DRM) device and method are provided. The DRM device includes a storage module which stores a rights object (RO) having predetermined meta information, a control module which provides meta information of ROs stored in the storage module when an RO detection request is input, and an integrity check module which maintains integrity of the meta information.