Lg Electronics Inc.

Man Soo Jeong

Il Gon Park

Sung Hyun Cho

Koo-yong Pak

Min Gyu Chung

Sung-hyun Cho

Min-gyu Chung

Soo Jung Kim

Koo Yong Pak

Kumar K Kiran

A secure signing method, a secure authentication method, and an IPTV system are disclosed. The secure signing method includes preparing digital signature header fields and setting an attribute, calculating a hash digest of content using a hashing algorithm, storing the calculated hash value in a message digest field of the digital signature header, encrypting the message digest using a secret key and inserting the encrypted message digest in a signature field of the digital signature header, and associating the digital signature header with the content by prefixing the digital signature header to the content. The secure authentication method includes checking whether a format and value of a digital signature header of content are appropriate, calculating a hash digest of the content using a hashing algorithm, comparing the calculated hash value with a message digest field of the digital signature header, decrypting the hash value of the signature field of the digital signature header using a public key extracted from a certificate field, and comparing the decrypted hash value with the message digest.

Secure signing method, secure authentication method and IPTV system

The present invention relates to a method of managing a domain employing a multi-domain manager and a domain system. The method of managing a domain employing a multi-domain manager includes designating a primary domain manager, configuring the domain by registering a domain device with the primary domain manager, designating at least one secondary domain manager of the domain devices, and managing the domain through conjunction of the primary domain manager and the secondary domain manager. Thus, domain management can be performed efficiently by employing a multi-domain manager.

Method for managing domain using multi domain manager and domain system

A method and system for processing content are provided. The method of processing content includes: receiving source data from a first system; interoperable-processing the source data and generating a target data; and transmitting the target data to a second system, the first system or the second system include at least one of access control system, copy protection system and use control system. Accordingly, it is possible to easily process non-compliant content in the DRM interoperable system.

Method and system for processing content

The present invention relates to transmission control of voice packets in a gateway system. The present invention makes a priority message having a priority level, separately stores a voice packet transmitted during communication and a data packet excluding the voice packet, on the basis of the priority level, and firstly outputs the voice packet stored in the high priority queue in accordance with the priority level.

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Seoul, South Korea

Man Soo Jeong