# US 6,681,326 B2 · Secure distribution of video on-demand > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,681,326 B2 - Document ID: US6681326B2 - Status: Granted - Kind: B2 - Application number: 09/850,231 - Filed: 2001-05-07 - Published: 2001-08-30 - Granted: 2004-01-20 - Earliest claimed: 1999-03-12 - Assignees: DIVA Systems Corporation - Inventors: Yong Ho Son; Christopher Goode - Web page: https://patentgrep.com/patent/US6681326B2 ## CPC - H04N 21/4542: {Blocking scenes or portions of the received content, e.g. censoring scenes} - H04N 7/1675: {Providing digital key or authorisation information for generation or regeneration of the scrambling sequence (pseudo-random number generators in general G06F7/58)} - H04N 7/17309: {Transmission or handling of upstream communications} - H04N 7/17318: {Direct or substantially direct transmission and handling of requests} - H04N 21/2347: involving video stream encryption - H04N 21/23473: {by pre-encrypting} - H04N 21/23476: {by partially encrypting, e.g. encrypting the ending portion of a movie} - H04N 21/47202: {for requesting content on demand, e.g. video on demand} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract In accordance with a first aspect, a remote server receives video programming in a first encrypted form and stores the video programming. After the remote server receives a request from a subscriber station for transmission of the video programming, the remote server decrypts the video programming, re-encrypts the video programming into a second encrypted form, and then transmits the video programming to the subscriber station. In accordance with a second aspect, a remote server receives video programming in a first encrypted form, decrypts the video programming, re-encrypts the video programming into a second encrypted form, and then stores the video programming. After the remote server receives a request from a subscriber station, the remote server simply transmits the video programming. In accordance with a third aspect, a remote server receives video programming in a first encrypted form and stores the video programming. After the remote server receives a request from a subscriber station, the remote server passes through the video content by transmitting the video programming. In accordance with a fourth aspect, a remote server receives pre-encrypted video programming and stores it. After the remote server receives a request from a subscriber station, the remote server completes encryption of the video programming and then transmits the video programming. ## Claims ### Claim 1 A method, comprising: storing at least one partially encrypted video program received from a programming source; processing a partially encrypted video program corresponding to a subscriber requested video program to produce a fully encrypted video program; and causing transmission of the fully encrypted video program to the requesting subscriber. ### Claim 2 (depends on 1) The method of claim 1, further comprising: causing the transmission of a decryption key to said requesting subscriber, said decryption key being necessary to decrypt said fully encrypted video program. ### Claim 3 (depends on 1) The method of claim 1, wherein said fully encrypted video program is encrypted according to a public key associated with said requesting subscriber, said public key having associated with it a private key necessary to decrypt said fully encrypted video program. ### Claim 4 (depends on 1) The method of claim 1, wherein said fully encrypted video program is encrypted according to a private key associated with said requesting subscriber, said private key having associated with it a public key necessary to decrypt said fully encrypted video program. ### Claim 5 (depends on 1) The method of claim 1, wherein said fully encrypted video program is encrypted according to a public key, said public key having associated with it a private key necessary to decrypt said fully encrypted video program, said method further comprising: causing the transmission of said private key to said requesting subscriber. ### Claim 6 (depends on 5) The method of claim 5, wherein said public key is encrypted prior to transmission to said requesting subscriber. ### Claim 7 (depends on 2) The method of claim 2, wherein said fully encrypted video program is transmitted to said requesting subscriber via a first communications channel and said decryption key is transmitted to said requesting subscriber via a second communications channel. ### Claim 8 (depends on 1) The method of claim 1, wherein said fully encrypted video program is encrypted according to a Data Encryption Standard. ### Claim 9 (depends on 1) The method of claim 1, further comprising: multiplexing said fully encrypted video program and other signals to create a multiplexed signal for transmission to said requesting subscriber. ### Claim 10 A method comprising: storing a video program encrypted in a first form; decrypting said program from said stored first form encrypting said program into a second form; and transmitting said second form to a subscriber. ### Claim 11 (depends on 10) The method of claim 10, wherein a first key is used to decrypt said first form of said program. ### Claim 12 (depends on 11) The method of claim 11, wherein said first key is transmitted on a communication channel different than a channel used to transmit said first form to said storing means. ### Claim 13 (depends on 10) The method of claim 10, wherein a second key is used to encrypt said program into said second form. ### Claim 14 (depends on 13) The method of claim 13, wherein said second key is a public key of a public key encryption system. ### Claim 15 (depends on 13) The method of claim 13, wherein said second key is a private key encryption system that encrypts and decrypts said second form. ### Claim 16 (depends on 15) The method of claim 15, wherein said private key encryption system utilizes a data encryption standard. ### Claim 17 (depends on 16) The method of claim 16, wherein said second key is transmitted from a remote server to said subscriber while encrypted in a third form. ### Claim 18 (depends on 17) The method of claim 17, wherein said subscriber isolates and de-encrypts said program. ### Claim 19 A computer readable medium including software instructions that, when executed by a processor, perform a method, comprising: means for storing a video program encrypted in a first form; means for decrypting said program from said stored first form; means for encrypting said program into a second form; and means for transmitting said second form to a subscriber.