# US 2013/0156187 A1 · Mobile iptv service system using downloadable conditional access system and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156187 A1 - Document ID: US20130156187A1 - Status: Published application - Kind: A1 - Application number: 13/624,345 - Filed: 2012-09-21 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Intellectual Discovery Co., Ltd. - Inventors: Eui Nam HUH; Young Rok SHIN - Web page: https://patentgrep.com/patent/US20130156187A1 ## CPC - H04L 63/0823: {using certificates (cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263)} - H04L 9/0816: {Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use} - H04L 63/0884: {by delegation of authentication, e.g. a proxy authenticates an entity to be authenticated on behalf of this entity vis-à-vis an authentication entity} - H04N 21/2347: involving video stream encryption - H04N 21/25875: {involving end-user authentication (restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06)} - H04N 21/26606: {for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] (arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14)} - H04N 21/26613: {for generating or managing keys in general (key distribution for secret or secure communication involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] H04L9/083; network support of key management H04L63/06; key management for network security in communication control or processing H04W12/04)} - H04N 21/41407: {embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop (constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57)} - H04N 21/4405: involving video stream decryption - H04N 21/4623: Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] {(arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14)} - H04N 21/63345: {by transmitting keys (key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06)} - H04N 21/64322: {IP} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An apparatus and method associated with an Internet Protocol Television (IPTV) service in a mobile environment are provided. A streaming server may provide a mobile terminal with a mobile certificate and an encryption key. In response to a content request received from the mobile terminal, the streaming server may provide the mobile terminal with encrypted content and a Downloadable Conditional Access System (DCAS) code. The mobile terminal may decrypt the encrypted content using the encryption key and the DCAS code, and may play back the decrypted content. ## Claims ### Claim 1 A method by which a service providing apparatus provides content to a mobile terminal, the method comprising: generating a mobile certificate and an encryption key; transmitting, to the mobile terminal, the mobile certificate and the encryption key; receiving, from the mobile terminal, the mobile certificate and a content request; generating a Downloadable Conditional Access System (DCAS) code, based on the mobile certificate; transmitting the DCAS code to the mobile terminal; and transmitting, to the mobile terminal, encrypted content corresponding to the content request, wherein the encrypted content is decrypted by the encryption key and the DCAS code. ### Claim 2 (depends on 1) The method of claim 1, wherein the encrypted content comprises Internet Protocol Television (IPTV) content, and is transmitted to the mobile terminal, and wherein the service providing apparatus comprises an IPTV server. ### Claim 3 (depends on 1) The method of claim 1, wherein the encrypted content is transmitted to the mobile terminal, through real-time streaming. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving a user authentication request from the mobile terminal; transmitting the user authentication request to an authentication server; and receiving, from the authentication server, user authentication information as a response to the user authentication request, wherein the mobile certificate and the encryption key are generated based on the user authentication information. ### Claim 5 (depends on 4) The method of claim 4, wherein the authentication server is operated by a Trusted Third Party (TTP), instead of an operator of the service providing apparatus. ### Claim 6 (depends on 1) The method of claim 1, further comprising: transmitting the content request to a content server; receiving, from the content server, content corresponding to the content request; and encrypting the content and generating the encrypted content. ### Claim 7 (depends on 6) The method of claim 6, further comprising: searching for the content server that stores the content, from among a plurality of content servers. ### Claim 8 (depends on 1) The method of claim 1, wherein the receiving of the mobile certificate and the content request, the generating of the DCAS code, the transmitting of the DCAS code to the mobile terminal, and the transmitting of the encrypted content to the mobile terminal are performed for each of a plurality of content requests. ### Claim 9 (depends on 8) The method of claim 8, wherein a plurality of encrypted contents respectively corresponding to the plurality of content requests are decrypted using a plurality of different DCAS codes corresponding to each of the plurality of encrypted contents, and a single encryption key corresponding to all of the plurality of encrypted contents. ### Claim 10 A service providing apparatus, comprising: a Downloadable Conditional Access System (DCAS) unit to generate a mobile certificate and an encryption key, to transmit, to a mobile terminal, the mobile certificate and the encryption key, to receive, from the mobile terminal, the mobile certificate and a content request, to generate a DCAS code based on the mobile certificate, and to transmit the DCAS code to the mobile terminal; and a streaming service unit to transmit, to the mobile terminal, encrypted content corresponding to the content request, wherein the encrypted content is decrypted by the encryption key and the DCAS code. ### Claim 11 (depends on 10) The service providing apparatus of claim 10, wherein the encrypted content comprises Internet Protocol Television (IPTV) content, and is transmitted to the mobile terminal, and wherein the service providing apparatus comprises an IPTV server. ### Claim 12 (depends on 10) The service providing apparatus of claim 10, wherein the encrypted content is transmitted to the mobile terminal, through real-time streaming. ### Claim 13 (depends on 10) The service providing apparatus of claim 10, wherein the DCAS unit receives a user authentication request from the mobile terminal, transmits the user authentication request to an authentication server, and receives, from the authentication server, user authentication information as a response to the user authentication request, and wherein the mobile certificate and the encryption key are generated based on the user authentication information. ### Claim 14 (depends on 13) The service providing apparatus of claim 13, wherein the authentication server is operated by a Trusted Third Party (TTP), instead of an operator of the service providing apparatus. ### Claim 15 (depends on 10) The service providing apparatus of claim 10, further comprising: a service management unit to transmit the content request to a content server, wherein the streaming service unit receives, from the content server, content corresponding to the content request, encrypts the content, and generates the encrypted content. ### Claim 16 (depends on 15) The service providing apparatus of claim 15, wherein the service management unit searches for the content server that stores the content, from among a plurality of content servers. ### Claim 17 (depends on 10) The service providing apparatus of claim 10, wherein, for each of a plurality of content requests, the DCAS unit receives the mobile certificate and the content request, generates the DCAS code, and transmits the DCAS code to the mobile terminal, and wherein the streaming service unit transmits the encrypted content to the mobile terminal, for each of the plurality of content requests. ### Claim 18 (depends on 17) The service providing apparatus of claim 17, wherein a plurality of encrypted contents respectively corresponding to the plurality of content requests are decrypted using a plurality of different DCAS codes corresponding to each of the plurality of encrypted contents, and a single encryption key corresponding to all of the plurality of encrypted contents.