# US 11,122,020 B2 · Streaming image encryption method and computer program, streaming image decryption method and computer program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,020 B2 - Document ID: US11122020B2 - Status: Granted - Kind: B2 - Application number: 16/256,046 - Filed: 2019-01-24 - Published: 2019-08-15 - Granted: 2021-09-14 - Earliest claimed: 2018-02-12 - Assignees: Hanwha Techwin Co., Ltd. - Applicants: Hanwha Techwin Co., Ltd. - Inventors: Young Hun Hong; Gun Soo Kim; Gyu Tae Lee; Jeong Sik Yun - Web page: https://patentgrep.com/patent/US11122020B2 ## CPC - H04L 63/0457: {wherein the sending and receiving network entities apply dynamic encryption, e.g. stream encryption (cryptographic mechanisms or cryptographic arrangements for stream encryption H04L9/065)} - H04N 5/38: Transmitter circuitry {for the transmission of television signals according to analogue transmission standards} (H04N5/14 takes precedence) - H04N 21/2347: involving video stream encryption - H04N 21/23476: {by partially encrypting, e.g. encrypting the ending portion of a movie} - H04N 21/2351: {involving encryption of additional data (arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23)} - H04N 21/2353: {specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata} - H04N 21/4223: Cameras (H04N23/00 takes precedence) - H04N 21/43856: {by partial decryption, e.g. decrypting a multiplex stream that has been partially encrypted} - H04N 21/44055: {by partially decrypting, e.g. decrypting a video stream that has been partially encrypted} - H04N 21/6437: Real-time Transport Protocol [RTP] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method of decrypting a streaming image includes: receiving a packet including at least an item which is encrypted, the item including at least one parameter used for decoding image data included in the streaming image; decrypting the item; and decoding the image data included in the streaming image based on the decrypted item, wherein the image data is not encrypted. ## Claims ### Claim 1 A method of decrypting a streaming image, the method comprising: receiving a packet comprising at least an item which is encrypted, the item comprising at least one parameter used for decoding image data included in the streaming image, wherein the packet is a control response packet received from an image transmitting device as a response to a command of an image receiving device for controlling reproduction of the streaming image; decrypting the item; receiving an image packet including at least a portion of the image data; and decoding the at least the portion of the image data based on the decrypted item, wherein the at least the portion of the image data is not encrypted. ### Claim 2 (depends on 1) The method of claim 1, wherein the control response packet is received from the image transmitting device in response to a connection request transmitted from the image receiving device under a real-time streaming protocol (RTSP), and wherein the image packet is received from the image transmitting device under a real-time transfer protocol (RTP). ### Claim 3 (depends on 1) The method of claim 1, wherein the control response packet is received from the image transmitting device during which a plurality of image packets constituting the streaming image are received from the image transmitting device, and wherein the decoding the image data included in the streaming image is performed based on a time corresponding to the controlling reproduction of the streaming image in reference to information included in the control response packet. ### Claim 4 (depends on 1) The method of claim 1, wherein the control response packet comprises information about the streaming image and a manner of encrypting the item, and wherein the manner of encrypting the item is determined based on at least one of a size of the item and identification information about the image receiving device receiving the packet. ### Claim 5 (depends on 1) The method of claim 1, wherein the item complies with a session description protocol (SDP) and comprises at least one of sequence parameter set (SPS) information, picture parameter set (PPS) information, and video parameter set (VPS) information about the streaming image. ### Claim 6 (depends on 1) The method of claim 1, further comprising transmitting a result of the decryption to the image transmitting device. ### Claim 7 A method of encrypting a streaming image, the method comprising: generating a packet by encrypting at least an item which is encrypted, the item comprising at least one parameter used for decoding image data included in the streaming image, wherein the packet is a control response packet transmitted to an image receiving device as a response to a command of the image receiving device for controlling reproduction of the streaming image; and transmitting the packet comprising the encrypted item to the image receiving device; and transmitting an image packet including at least a portion of the image data, wherein the at least the portion of the image data is not encrypted. ### Claim 8 (depends on 7) The method of claim 7, wherein the control response packet is transmitted to the image receiving device during which a plurality of image packets constituting the streaming image are transmitted to the image receiving device, and wherein the decoding the image data included in the streaming image is performed based on a time corresponding to the controlling reproduction of the streaming image in reference to information included in the control response packet. ### Claim 9 (depends on 7) The method of claim 7, wherein the control response packet comprises information about the streaming image and a manner of encrypting the item, and wherein the manner of encrypting the item is determined based on at least one of a size of the item and identification information about the image receiving device receiving the packet. ### Claim 10 (depends on 7) The method of claim 7, wherein the item complies with a session description protocol (SDP) and comprises at least one of sequence parameter set (SPS) information, picture parameter set (PPS) information, and video parameter set (VPS) information about the streaming image. ### Claim 11 (depends on 1) A non-transitory computer-readable recording medium storing an instruction to control a processor to perform the method of claim 1. ### Claim 12 (depends on 7) A non-transitory computer-readable recording medium storing an instruction to control a processor to perform the method of claim 7.