Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Hiromichi Shimada

Yoshihiro Tosaki

Shinichi Tanaka

Masaru Odagiri

Shinji Inoue

Tsutomu Kai

Miki Shimizu

Disclosed is a content recording apparatus having recording devices A and B and first and second encrypting units that are provided for the respective recording devices. When receiving stream data representing content from an input unit, a rate changing unit operates so as to input streams of data in parallel to the respective encrypting units. The first encrypting unit encrypts the stream data with an encryption key generated from the IDs of the recording device A and of a recording medium a. The second encrypting unit encrypts the stream data with an encryption key generated from the IDs of the recording device B and of a recording medium b. Each of the recording devices A and B records the content encrypted by a corresponding one of the first and second encrypting units.

Content recording apparatus, method for controlling the content recording apparatus, and recording program for the content recording apparatus

In a DVD player, when data information in a DVD disk is played back, it is judged whether the data information is protected by a copyright or not on the basis of disk control information. Further, it is judged whether the DVD disk is writable or not, based on whether the DVD disk is provided with a wobble or not. Thus, if the data information is protected by the copyright and the DVD disk is writable, a playback of the DVD disk is prevented so that an illegal use of the DVD disk, which infringes the copyright, is effectively prevented.

Optical disk, method of reproducing and copying optical disk, and method of preventing illegal use of optical disk

A DVD-R has a main information area where data information is recorded in a track having a wobble, and first and second control data areas each of which is disposed in an inner space closer to the disk center than the main information area . The information structure and physical structure of the first control area are different from those of the second control area . In the second control area , predetermined physical format information and disk production information, for example, the last address of when data is written in the DVD-R , the maximum transfer rate or the like, are recorded. Thus, when the DVD-R is reproduced by a DVD player etc., the physical format information and disk production information etc. recorded in the second control data area are read. Thereby, the disk can be precisely identified without spoiling the physical format information, the disk production information or the like, and further illegal use of the DVD or another optical disk leading up to breach of the copyright can be effectively prevented.

Recordable optical disk

A DVD-R has a main information area where data information is recorded in a track having a wobble, and first and second control data areas each of which is disposed in an inner space closer to the disk center than the main information area The information structure and physical structure of the first control area are different from those of the second control area In the second control area predetermined physical format information and disk production information, for example, the last address of when data is written in the DVD-R the maximum transfer rate or the like, are recorded. Thus, when the DVD-R is reproduced by a DVD player etc., the physical format information and disk production information etc. recorded in the second control data area are read. Thereby, the disk can be precisely identified without spoiling the physical format information, the disk production information or the like, and further illegal use of the DVD or another optical disk leading up to breach of the copyright can be effectively prevented.

A DVD-R has a main information area where data information is recorded in a track having a wobble, and first and second control data areas each of which is disposed in an inner space closer to the disk center than the main information area . The information structure and physical structure of the first control area are different from those of the second control area . In the second control area , predetermined physical format information and disk production information, for example, the last address of when data is written in the DVD-R , the maximum transfer rate or the like, are recorded. Thus, when the DVD-R is reproduced by a DVD player etc., the physical format Information and disk production information etc. recorded in the second control data area are read. Thereby, the disk can be precisely identified without spoiling the physical format information, the disk production information or the like, and further illegal use of the DVD or another optical disk leading up to breach of the copyright can be effectively prevented.

A DVD-R has a main information area where data information is recorded in a track having a wobble, and first and second control data areas each of which is disposed in an inner space closer to the disk center than the main information area The information structure and physical structure of the first control area are different from those of the second control area In the second control area predetermined physical format information and disk production information, for example, the last address of when data is written in the DVD-R , the maximum transfer rate or the like, are recorded. Thus, when the DVD-R is reproduced by a DVD player etc., the physical format information and disk production information etc. recorded in the second control data area are read. Thereby, the disk can be precisely identified without spoiling the physical format information, the disk production information or the like, and further illegal use of the DVD or another optical disk leading up to breach of the copyright can be effectively prevented.

A composite digital signal received by a recording and reproducing apparatus includes a digital information signal and a control signal. The control signal represents a number of digital copy generation of the associated information signal. The information signal of the received digital composite signal is recorded into recording medium. The information signal is reproduced from the recording medium. During the reproduction of the information signal, a new control signal is generated which represents a number equal to one plus the number represented by the control signal of the received composite digital signal. The new control signal and the reproduced information signal are combined into a new composite digital signal. The new composite digital signal is outputted. A check is made as to whether or not the number represented by the control signal of the received composite digital signal is equal to a predetermined number. When the number represented by the control signal of the received composite digital signal is equal to the predetermined number, the recording of the information signal of the received composite digital signal is inhibited.

Recording and reproducing apparatus with limited digital copying

The invention includes an A/D converter, a digital input, decoder for demodulating a signal supplied to a digital input terminal to decode it into respective blocks of data, a digital copy control signal detecting portion for detecting a digital copy control signal from a channel status signal in an output signal of the digital input decoder, a digital copy permissibility decision portion for deciding whether digital copying is permissible or not, according to an output of the digital copy control signal detecting portion, a recording signal selecting portion for selecting one of an output signal of the A/D converter and an output signal of the digital input decoder and supplying the selected signal to a recording signal processing circuit, a first selection switch for selecting one of an output signal of a reproduced signal processing circuit and an output signal of the digital input decoder and supplying the selected signal to a D/A converter, and a second selection switch for selecting one of an output signal of the D/A converter and a signal supplied to an analog signal input terminal and supplying the selected signal to the A/D converter, whereby even in the digital recording mode, when the digital copying permissibility decision portion decides that digital copying is impermissible, the recording signal selecting portion selects an output signal of the A/D converter, the first selection switch selects an output signal of the digital input decoder, and the second selection switch selects the output signal of the D/A converter, so that a change is made from the digital recording mode to the analog recording mode, and thus a continuous recording is made.

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Hyogo, Japan

Hiromichi Shimada