IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0258890
(2002-03-07)
|
우선권정보 |
JP-2001-64365(2001-03-08) |
국제출원번호 |
PCT/JP02/002111
(2002-03-07)
|
§371/§102 date |
20030324
(20030324)
|
국제공개번호 |
WO02/073959
(2002-09-19)
|
발명자
/ 주소 |
- Hirai,Jun
- Kohashi,Takashi
|
출원인 / 주소 |
|
대리인 / 주소 |
Lerner, David, Littenberg, Krumholz &
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
5 |
초록
▼
A copy control technique using digital watermark information, which makes it possible to prevent a content from being erroneously subjected to a copy control process according to wrong copy control information at a content-to-content transition. Copy control information in the form of digital waterm
A copy control technique using digital watermark information, which makes it possible to prevent a content from being erroneously subjected to a copy control process according to wrong copy control information at a content-to-content transition. Copy control information in the form of digital watermark information (WM) is embedded in a content to control copying of the content in accordance with the embedded copy control information. A content-to-content transition is detected by detecting a change in a content state, such as a change in image luminance, or a change in copy control information associated with a content, or is detected on the basis of a flag, a descriptor, or channel switching. In response to detection of a content-to-content transition, a reset signal is output to a WM analyzer to reset current copy control information into a "undefined" state, so that copy control is performed in a mode such as a copy-free mode assigned to the "undefined" state.
대표청구항
▼
The invention claimed is: 1. A digital watermark decoding system for use in data processing apparatus for performing at least one of a data recording process, a data playing-back process, and a data inputting/outputting process, in which copy control information represented in digital watermark inf
The invention claimed is: 1. A digital watermark decoding system for use in data processing apparatus for performing at least one of a data recording process, a data playing-back process, and a data inputting/outputting process, in which copy control information represented in digital watermark information is detected, and copying of data is controlled in accordance with the detected copy control information included in the digital watermark information, said digital watermark decoding system detecting a digital watermark embedded in a content and outputting detected copy control information as control information applied to a content to be processed, said digital watermark decoding system comprising: state change detection means for detecting a transition from a content to another content having a possibility that copy control information embedded therein is different from copy control information embedded in the former content, and outputting a reset signal to digital watermark information analysis means in response to detecting of a state change corresponding to the content transition; and digital watermark information analysis means for resetting control information applied to the content in accordance with the reset signal received from the state change detection means, and outputting, as control information to be applied to the content, undefined control information corresponding to non-detection of a digital watermark, wherein when the digital watermark information output from the digital watermark information analysis means is undefined, and when a content to be processed includes copy control information, added thereto, other than digital watermark information, the copy control information other than the digital watermark information is employed as control information to be applied to the content. 2. The digital watermark decoding system according to claim 1, wherein when the digital watermark information output from the digital watermark information analysis means is undefined, and when a content to be processed includes copy control information, added thereto, other than digital watermark information, history of the copy control information other than digital watermark information and history of copy control information described in the digital watermark information are checked to determine whether these two kinds of copy control information were consistent with each other over a predetermined period, and, only when it is determined that the two kinds of copy control information were consistent with each other over that period, the copy control information other than digital watermark information is employed as copy control information to be applied to the content. 3. The digital watermark decoding system according to claim 1, wherein said copy control information other than digital watermark information is copy generation management system information. 4. The digital watermark decoding system according to claim 1, wherein the state change detection means monitors a change in signal information of a content being processed; and, when a change greater than a predetermined threshold is detected, the state change detection means determines that a content-to-content transition has occurred, and the state change detection means outputs a reset signal to the digital watermark information analysis means. 5. The digital watermark decoding system according to claim 1, wherein the state change detection means monitors a change in copy control information serving as additional information other than digital watermark information, added to a content being processed; and, when a change is detected, the state change detection means determines that a content-to-content transition has occurred, and the state change detection means outputs a reset signal to the digital watermark information analysis means. 6. The digital watermark decoding system according to claim 1, wherein the state change detection means monitors a change in one of a descriptor and a flag serving as additional information other than digital watermark information, added to a content being processed; and, when a change is detected, the state change detection means determines that a content-to-content transition has occurred, and the state change detection means outputs a reset signal to the digital watermark information analysis means. 7. The digital watermark decoding system according to claim 1, wherein the state change detection means monitors channel switching; and, when channel switching is detected, the state change detection means determines that a content-to-content transition has occurred, and the state change detection means outputs a reset signal to the digital watermark information analysis means. 8. The digital watermark decoding system according to claim 1, wherein the state change detection means monitors presence/absence of an input signal and determines that a content-to-content transition has occurred when one of a presence-to-absence transition, an absence-to-presence transition, and a presence-to-absence-to-presence transition is detected, and the state change detection means outputs a reset signal to the digital watermark information analysis means in response to the detection of the content-to-content transition. 9. A digital watermark decoding method for use with a data processing method of performing at least one of a data recording process, a data playing-back process, and a data inputting/outputting process, in which copy control information represented in digital watermark information is detected, and copying of data is controlled in accordance with the detected copy control information included in the digital watermark information, said digital watermark decoding method including detecting a digital watermark embedded in a content and outputting detected copy control information as control information applied to a content to be processed, said digital watermark decoding method comprising the steps of: detecting a transition from a content to another content having a possibility that copy control information embedded therein is different from copy control information embedded in the former content, and outputting a reset signal to digital watermark information analysis means in response to detecting of a state change corresponding to the content transition; and resetting control information applied to the content in accordance with the input reset signal, and outputting, as control information to be applied to the content, undefined control information corresponding to non-detection of a digital watermark, wherein when the digital watermark information output from the digital watermark information analysis means is undefined, and when a content to be processed includes copy control information, added thereto, other than digital watermark information, the copy control information other than the digital watermark information is employed as control information to be applied to the content. 10. The digital watermark decoding method according to claim 9, wherein when the digital watermark information output from the digital watermark information analysis means is undefined, and when a content to be processed includes copy control information, added thereto, other than digital watermark information, a history of the copy control information other than digital watermark information and history of copy control information described in the digital watermark information are checked to determine whether these two kinds of copy control information were consistent with each other over a predetermined period, and only when it is determined that the two kinds of copy control information were consistent with each other over that period, the copy control information other than digital watermark information is employed as copy control information to be applied to the content. 11. The digital watermark decoding method according to claim 9, wherein said copy control information other than digital watermark information is copy generation management system information. 12. The digital watermark decoding method according to claim 9, wherein the state change detecting step includes monitoring a change in signal information of a content being processed; and, when a change greater than a predetermined threshold is detected, determining that a content-to-content transition has occurred and outputting a reset signal to the digital watermark information analysis means. 13. The digital watermark decoding method according to claim 9, wherein the state change detecting step includes monitoring a change in copy control information serving as additional information other than digital watermark information, added to a content being processed; and, when a change is detected, determining that a content-to-content transition has occurred and outputting a reset signal to the digital watermark information analysis means. 14. The digital watermark decoding method according to claim 9, wherein the state change detecting step includes monitoring one of a change in a descriptor and a flag serving as additional information other than digital watermark information, added to a content being processed; and when a change is detected, determining that a content-to-content transition has occurred and outputting a reset signal to the digital watermark information analysis means. 15. The digital watermark decoding method according to claim 9, wherein the state change detecting step includes monitoring channel switching; and, when channel switching is detected, determining that a content-to-content transition has occurred, and outputting a reset signal to the digital watermark information analysis means. 16. The digital watermark decoding method according to claim 9, wherein the state change detecting step includes monitoring a presence/absence of an input signal, determining that a content-to-content transition has occurred when one of a presence-to-absence transition, an absence-to-presence transition, and a presence-to-absence-to-presence transition is detected, and outputting a reset signal to the digital watermark information analysis means in response to detection of the content-to-content transition. 17. A digital watermark decoding method for use in a computer program for causing a computer system to execute at least one of a data recording process, a data playing-back process, and a data inputting/outputting process, in which copy control information represented in digital watermark information is detected, and copying of data is controlled in accordance with the detected copy control information included in the digital watermark information, said digital watermark decoding method including detecting a digital watermark embedded in a content and outputting detected copy control information as control information applied to a content to be processed, said digital watermark decoding method comprising the steps of: detecting a transition from a content to another content having a possibility that copy control information embedded therein is different from copy control information embedded in the former content, and outputting a reset signal to digital watermark information analysis means in response to detecting of a state change corresponding to the content transition; and resetting control information applied to the content in accordance with the input reset signal, and outputting, as control information to be applied to the content, undefined control information corresponding to non-detection of a digital watermark, wherein when the digital watermark information output from the digital watermark information analysis means is undefined, and when a content to be processed includes copy control information, added thereto, other than digital watermark information, the copy control information other than the digital watermark information is employed as control information to be applied to the content.
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