Content distribution system, content distribution server, content distribution method, and content distribution program

• US 8,776,159 B2
• Filed: 11/27/2008
• Issued: 07/08/2014
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Asakura, Takayoshi
• Primary Examiner(s): Goodarzi, Nasser
• Assistant Examiner(s): PIERORAZIO, MICHAEL
• Application Number:
  US12/744,621
• Publication Number:
  US 20100263013A1
• Time in Patent Office: 2,049 Days
• Field of Search: 725/116
• US Class Current: 725/116
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: H04N 21/2396 characterized by admission policies admission control, resource allocation in open networks H04L12/5692; arrangements for network security using user profiles for access control H04L63/102; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/4333 Processing operations in response to a pause request
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/443 OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
• CPC Class Codes: H04N 21/47202 for requesting content on demand, e.g. video on demand
• CPC Class Codes: H04N 21/4788 communicating with other users, e.g. chatting arrangements for providing for computer conferences, e.g. chat rooms, to substation in data switching networks H04L12/1813; distributed application using peer-to-peer [P2P] networks H04L67/104
• CPC Class Codes: H04N 7/17318 Direct or substantially direct transmission and handling of requests

Abstract

A content distribution system is provided, in which time-shift viewing among a plurality of devices can be realized. The system includes, a device group management unit which manages a group to which audio-visual devices capable of realizing time-shift viewing mutually belong; a viewing state management unit which acquires viewing information of a content by the audio-visual device, and a time shift control unit which transmits permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by the viewing state management unit, to the audio-visual device included in the group managed by the device group management unit, in response to a time shift request issued by the audio-visual device.

Claims

1. A content distribution system for distributing a content such that the content is able to be viewed in a time-shifted manner by an audio-visual device, comprising:

a device group management unit which manages a group to which audio-visual devices belong, the audio-visual devices all being determined to be used only by a same user and being capable of realizing time-shift viewing mutually;

a viewing state management unit which acquires viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

a time shift control unit which transmits permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by the viewing state management unit, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group managed by the device group management unit, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.

2. The content distribution system according to claim 1, wherein the distribution server determines whether or not time-shift viewing is able to be realized by an audio-visual device receiving the permission information, based on the information received from the time shift control unit.

3. The content distribution system according to claim 1, wherein the time shift control unit specifies a content which is an object of time-shift viewing, and transmits viewing information of the content acquired by the viewing state management unit.

4. The content distribution system according to claim 1, wherein the time shift control unit specifies a content which is an object of time-shift viewing based on information managed by the device group management unit and the viewing state management unit, and transmits viewing information of the content acquired by the viewing state management unit.

5. The content distribution system according to claim 1, wherein in addition to permission for time-shift viewing of the content and the viewing information of the content acquired by the viewing state management unit, the time shift control unit transmits a content list for specifying the content which is an object of the time-shift viewing.

6. The content distribution system according to claim 1, wherein

the distribution server includes a multicast distribution server which performs multicast distribution of a content, and a unicast distribution server which performs unicast distribution of a content, and

the unicast distribution server distributes, in a unicast distribution manner, a content distributed from the multicast distribution server to an audio-visual device which received the permission information.

7. The content distribution system according to claim 1, wherein the viewing state management unit acquires viewing information of the content from the audio-visual device viewing the content.

8. The content distribution system according to claim 1, wherein the viewing state management unit acquires viewing information of the content from one audio-visual device which received the time shift request from another audio-visual device.

9. The content distribution system according to claim 6, wherein the unicast distribution server includes a content conversion unit which applies, to the content to be distributed, a process of adjusting replay time in the audio-visual device.

10. A content distribution server for distributing a content to audio-visual devices capable of realizing time-shift viewing mutually, comprising:

a device group management unit which manages a group to which audio-visual devices belong, the audio-visual devices all being determined to be used only by a same user and being capable of realizing time-shift viewing mutually;

a viewing state management unit which acquires viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

a time shift control unit which transmits permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by the viewing state management unit, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group managed by the device group management unit, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.

11. The content distribution server according to claim 10, wherein the distribution server determines whether or not time-shift viewing is able to be realized by an audio-visual device receiving the permission information, based on the information received from the time shift control unit.

12. A content distribution method for distributing a content such that the content is able to be viewed in a time-shifted manner by an audio-visual device, comprising:

managing a group to which audio-visual devices belong, the audio-visual devices all being determined to be used only by a same user and being capable of realizing time-shift viewing mutually;

acquiring viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

transmitting permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by a viewing state management unit, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.

13. The content distribution method according to claim 12, wherein the distribution server determines whether or not time-shift viewing is able to be realized by an audio-visual device receiving the permission information, based on the information received from a time shift control unit.

14. The content distribution method according to claim 12, wherein a content which is an object of time-shift viewing is specified, and viewing information of the acquired content is transmitted.

15. The content distribution method according to claim 12, wherein in addition to permission for time-shift viewing of the content and the viewing information of the content acquired by the viewing state management unit, a content list for specifying the content which is an object of the time-shift viewing is also transmitted.

16. The content distribution method according to claim 12, wherein a content distributed in a multicast distribution manner is distributed in a unicast distribution manner to an audio-visual device which received the permission information.

17. The content distribution method according to claim 12, wherein viewing information of the content is acquired from the audio-visual device viewing the content.

18. The content distribution method according to claim 12, wherein viewing information of the content is acquired from one audio-visual device which received the time shift request from another audio-visual device.

19. A non-transitory computer readable recording medium storing a content distribution program for controlling distribution of a content such that the content is able to be viewed in a time-shifted manner by an audio-visual device, the program causing a computer to perform:

a function of managing a group to which audio-visual devices belong, the audio-visual devices all being determined to be used only by a same user and being capable of realizing time-shift viewing mutually;

a function of acquiring viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

a function of transmitting permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by a viewing state management unit, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.

20. A content distribution system for distributing a content such that the content is able to be viewed in a time-shifted manner by an audio-visual device, comprising:

device group management means for managing a group to which audio-visual devices belong, the audio-visual devices all being determined to be used only by a same user and being capable of realizing time-shift viewing mutually;

viewing state management means for acquiring viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

time shift control means for transmitting permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by the viewing state management means, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group managed by the device group management means, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.

21. A content distribution server for distributing a content to audio-visual devices capable of realizing time-shift viewing mutually, comprising:

device group management means for managing a group to which audio-visual devices belong, the audio-visual devices all being used by a same user and being capable of realizing time-shift viewing mutually;

viewing state management means for acquiring viewing information of the content by one of the audio-visual devices, the viewing information including a content identifier for uniquely identifying a viewing content and a content replay position that specifies a viewing position of the same user in the content; and

time shift control means for transmitting permission information for viewing the content in a time-shifted manner and the viewing information of the content acquired by the viewing state management means, to (i) a distribution server which distributes the content and (ii) another of the audio-visual devices included in the group managed by the device group management means, in response to a time shift request issued by the another of the audio-visual devices without the same user having to perform an authentication procedure.