US 2003/0154377 A1 · Data processing apparatus , data processing method, and program

Abstract

The present invention provides 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.

Claims19

Dependent claims

A data processing apparatus for performing at least one of data processes including 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 data processing apparatus including digital watermark decoding means for 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 means 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 that 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.

1 more element

A data processing method of performing at least one of data processes including 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 data processing method including a digital watermark decoding step of 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 step including the steps of:
detecting a transition from a content to another content having a possibility that copy control information embedded therein is different from that 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.

2 more elements

Dependencies are inferred from the claim text.

Data processing apparatus , data processing method, and program

Life of this patent

Data processing apparatus , data processing method, and program

Life of this patent

Abstract

Claims19