Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-11-18
2004-08-24
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C380S201000
Reexamination Certificate
active
06782191
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an additional information superposing method of superposing additional information on an information signal which is provided with it being recorded on a recording medium such as a DVD (Digital Video Disc) and so on or an information signal transmitted through a transmission medium such as internet and broadcasting media and so on, an information signal copy control method of controlling a copy generation of an information signal by using additional information added to the information signal, an information signal output device and an information signal recording device.
2. Description of the Related Art
In recent years, with the spread of digital contents such as internet and digital video disk or the like, there arises a problem of piracy that the digital contents are copied illegally. Therefore, in order to cope with this problem, it is considered that information for controlling a copy is added to the digital contents and the illegal copy is prevented by using the additional information.
As for the control to prevent the copy, two cases are considered such that copy is not permitted at all according to an information source and that copy is permitted once but the obtained copy is forbidden to be copied again (generation limit copy control method). The former case is applied to an original software such as a DVD-ROM which is produced and dealt by a contents maker. The latter generation limit copy control method is applied to information which is broadcasted in broadcasting media, for example.
In the case of the generation limit copy control method, a system which is capable of controlling the copy generation effectively is desired. As the copy control information system which is capable of managing the copy generation, a CGMS (Copy Generation Management System) and a method using an electronic watermarking process are suggested.
The electronic watermarking process embeds information as a noise into a portion which exists in image data or music data and is not important for human perceptivity, namely, a portion which is not redundant with respect to music or image. Additional information, which was embedded into image data or music data by such an electronic watermarking process, was hardly removed from the image data or music data. Meanwhile, even after image data or music data are subject to a filtering process or data compressing process, the additional information as electronic watermarking information embedded thereinto can be detected from the image data or music data.
In the case of the copy control method using the electronic watermarking process, additional information to be embedded represents the following four states:
(1) “Copy Free”;
(2) “One Copy”;
(3) “No more Copy”; and
(4) “Never Copy”,
namely, it represents copy generation of image data or music data on which the electronic watermarking information was superposed and the copy limit state.
(1) “Copy Free” represents that music data or image data can be copied freely. (2) “One Copy” represents that music data or image data can be copied only once. (3) “No More Copy” represents that music data or image data are obtained from the music data or image data in the state of (2) “One Copy”, and they are not allowed to be copied again. (4) “Never Copy” represents that music data or image data are never allowed to be copied.
In the case where the electronic watermarking information which was superposed on image data or music data is “One Copy”, a judgment is made that the image data or music data can be copied and recorded and the recording is executed in a recording device which can execute the electronic watermarking process (namely, copy limit process), but the electronic watermarking information which was rewritten into “No More Copy” is superposed on the recorded image data or music data. In the case where the electronic watermarking information which was superposed on the image data or music data to be recorded is “No More Copy”, a judgment is made that the image data or music data are not allowed to be copied and recorded and the recording is forbidden in the recording device which can execute the electronic watermarking process.
In the CGMS system, in the case of an analog image signal, for example, additional information of 2 bits for copy control is superposed on specified one horizontal period within the vertical blanking period, and in the case of a digital image signal, additional information of 2 bits for copy control is added to the digital image data so that the data are transmitted.
The contents of the information of 2 bits in the CGMS system (hereinafter, referred to as CGMS information) are:
[00] . . . copy free;
[10] . . . one copy (copy by only one generation); and
[11] . . . never copy.
In the CGMS system, the above-mentioned state “No More Copy”does not exist.
In the case where the CGMS information added to image information is [10], a judgment is made that the image information can be copied and recorded and the recording is executed in a recording device which can cope with CGMS, but the CGMS information which was rewritten into [11] is added to the recorded image signal. In the case where the CGMS information added to the image information to be recorded is [11], a judgment is made that the image signal is not allowed to be copied and recorded and the recording is forbidden in the recording device which can cope with CGMS.
Incidentally, in the case where the copy of an analog image signal or digital image signal is controlled by the CGMS system as mentioned above, the CGMS information of 2 bits is added to a specified position which is separated from a signal forming an image.
For this reason, in the case where, for example, the digital image signal to which the CGMS information was added is used, it is considered that when the digital image signal is converted into an analog image signal so as to be utilized, the CGMS information is possibly lost.
In this case, even when the digital image signal is forbidden to be copied by the CGMS information, by converting the digital image signal into an analog image signal, it becomes possible that the analog image signal is freely copied.
Therefore, as the additional information for copy control, it is considered that electronic watermarking information is superposed on information signals such as an analog image signal and a digital image signal so as to be provided. As mentioned above, since the electronic watermarking information is superposed on an information signal, it is difficult to remove the electronic watermarking information from the information signal or alter it.
In addition, since the electronic watermarking information can represent a copy generation and copy limit state of an information signal as mentioned above, in the recording device which can cope with the electronic watermarking process, the copy of the information signal can be controlled securely and properly based on the electronic watermarking information.
However, as mentioned above, in the case where the electronic watermarking information representing “One Copy” is superposed on an information signal, the information signal is copied based on the electronic watermarking information in the recording device which can cope with the electronic watermarking process. However, since the copied information signal is forbidden to be copied again, the electronic watermarking information added to the information signal to be recorded should be rewritten into “No More Copy”.
In this case, the following two methods are considered. In one method, the electronic watermarking information representing “No More Copy” is overwritten on the information signal on which the electronic watermarking information representing “One Copy” was superposed. In the other method, after the electronic watermarking information representing “One Copy” is deleted from the information signal on which the electronic watermarking information representing “One Copy”
Ikeda Nozomu
Moriwaki Hisayoshi
Ogino Akira
Chieu Po-lin
Frommer William S.
Sony Corporation
Tran Thai
LandOfFree
Additional information superposing method, information... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Additional information superposing method, information..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Additional information superposing method, information... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3323339