JPH103746A - Copywrite protection system - Google Patents

Copywrite protection system

Info

Publication number
JPH103746A
JPH103746A JP8151117A JP15111796A JPH103746A JP H103746 A JPH103746 A JP H103746A JP 8151117 A JP8151117 A JP 8151117A JP 15111796 A JP15111796 A JP 15111796A JP H103746 A JPH103746 A JP H103746A
Authority
JP
Japan
Prior art keywords
information
encryption key
key
reading
encrypted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8151117A
Other languages
Japanese (ja)
Inventor
Yasuyuki Sakai
康行 酒井
Atsuhiro Yamagishi
篤弘 山岸
Eisaku Takeda
栄作 竹田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8151117A priority Critical patent/JPH103746A/en
Publication of JPH103746A publication Critical patent/JPH103746A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
    • G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier

Abstract

PROBLEM TO BE SOLVED: To prevent the illicit duplication of digital information and to protect the right of a writer by recording enciphered digital information on an information recording medium and providing this medium with the following elements. SOLUTION: The information recording medium 101 is provided with a protection region 102 where first encryption key is recorded and an ordinary region 103 where the enciphered digital information is recorded by using this first encryption key. An information recorded by using this first encryption key. An information processor 104 has a first reading means 105 for reading the first encryption key, a second reading means 106 for reading the digital information and an enciphering means 107 for enciphering the first encryption key with second encryption key. An information reproducing device 109 has an input means 110 to be inputted with the first encryption key and digital information outputted from an output means 108 and a decoding means 111 for decoding the enciphered first encryption key and digital information. A key distributing device 112 has a key forming means 113 for forming the second encryption key and a key distributing means 114 for distributing the formed second encryption key to the information processor 104 and the information reproducing device 109.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ディジタル情報の
不正な複製を防ぎ、著作者の権利を保護できる著作権保
護システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copyright protection system capable of preventing unauthorized duplication of digital information and protecting the rights of authors.

【０００２】[0002]

【従来の技術】従来のＤＶＤ（Ｄｉｇｉｔａｌ Ｖｉｄ
ｅｏ Ｄｉｓｃ）を再生する装置について説明する。2. Description of the Related Art Conventional DVDs (Digital Vid)
An apparatus for playing back (eo Disc) will be described.

【０００３】図２は、ＤＶＤを再生するための従来の光
ディスクシステムである。図において２０１はＤＶＤ再
生装置、２０２はディスク、２０３はＣＤ−ＲＯＭデコ
ーダ、２０４は復調回路、２０５は誤り訂正回路、２０
６はマルチプレクサ、２０７はバスインタフェースであ
る。ＤＶＤ再生装置２０１はＤＶＤとＣＤ−ＲＯＭの両
方のディスクを再生できるように構成されている。次に
動作を説明する。ディスク２０２から読み出されたディ
ジタル情報は、ＣＤ−ＲＯＭデコーダ２０３および復調
回路２０４に入力される。ＣＤ−ＲＯＭデコーダ２０３
ではＣＤ−ＲＯＭの場合の復調、誤り訂正が行われる。
復調回路２０４ではディスクから読み出された信号をデ
ィジタル情報に復調する。復調されたディジタル情報
は、誤り訂正回路２０５に入力され、ＤＶＤフォーマッ
トの情報の誤り訂正を行う。マルチプレクサ２０６で
は、ディスク２０２がＤＶＤ、ＣＤ−ＲＯＭのいずれで
あるかに応じて情報を選択し、バスインタフェース２０
７に出力する。FIG. 2 shows a conventional optical disk system for reproducing a DVD. In the figure, 201 is a DVD reproducing device, 202 is a disk, 203 is a CD-ROM decoder, 204 is a demodulation circuit, 205 is an error correction circuit, 20
6 is a multiplexer and 207 is a bus interface. The DVD reproducing device 201 is configured to be able to reproduce both DVD and CD-ROM discs. Next, the operation will be described. The digital information read from the disk 202 is input to a CD-ROM decoder 203 and a demodulation circuit 204. CD-ROM decoder 203
Performs demodulation and error correction in the case of a CD-ROM.
The demodulation circuit 204 demodulates the signal read from the disk into digital information. The demodulated digital information is input to an error correction circuit 205, where error correction of information in the DVD format is performed. The multiplexer 206 selects information depending on whether the disk 202 is a DVD or a CD-ROM, and
7 is output.

【０００４】[0004]

【発明が解決しようとする課題】従来のＤＶＤを再生す
る光ディスクシステムは、ディスクに記録されているデ
ィジタル情報は暗号化されておらず、また、再生する際
にも暗号化は施されず、記録されている情報をそのまま
再生していた。そのため、ディスクに記録されているデ
ィジタル情報の複製を作ることが容易であり、情報の著
作者の権利を保護することが困難であるという課題があ
った。In the conventional optical disk system for reproducing DVDs, digital information recorded on the disk is not encrypted, and is not encrypted during reproduction. Information that was being played back. Therefore, there is a problem that it is easy to make a copy of the digital information recorded on the disc, and it is difficult to protect the rights of the creator of the information.

【０００５】本発明の目的は、係る課題を解決するため
になされたもので、ディジタル情報の複製を作ることが
困難で、著作者の権利を保護することができる著作権保
護システムを得ることにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a copyright protection system which makes it difficult to copy digital information and protects the rights of the author. is there.

【０００６】[0006]

【課題を解決するための手段】本発明の請求項１に係る
著作権保護システムは、以下の要素を備えたものであ
る。 （ａ）情報の読み出しに特別な手段を必要とする保護領
域と、情報の読み出しに特別な手段を必要としない通常
の領域とを設け、前記保護領域には第１の暗号化鍵が記
録され、前記通常の領域には前記第１の暗号化鍵を用い
て暗号化されたディジタル情報が記録された情報記録媒
体； （ｂ）前記第１の暗号化鍵を読み取る第１の読み取り手
段と、前記ディジタル情報を読み取る第２の読み取り手
段と、前記第１の暗号化鍵を第２の暗号化鍵で暗号化す
る暗号化手段と、前記暗号化された第１の暗号化鍵と前
記暗号化されたディジタル情報を出力する出力手段とを
備えた情報処理装置； （ｃ）前記出力手段より出力された、前記暗号化された
第１の暗号化鍵と前記暗号化されたディジタル情報が入
力される入力手段と、前記暗号化された第１の暗号化鍵
と、前記暗号化されたディジタル情報とを復号する復号
手段を備えた情報再生装置； （ｄ）前記第２の暗号化鍵を生成する鍵生成手段と、生
成された前記第２の暗号化鍵を前記情報処理装置と前記
情報再生装置とに配送する鍵配送手段とを備えた鍵配送
装置。A copyright protection system according to a first aspect of the present invention includes the following elements. (A) A protected area that requires special means for reading information and a normal area that does not require special means for reading information are provided, and a first encryption key is recorded in the protected area. An information recording medium in which digital information encrypted using the first encryption key is recorded in the normal area; (b) first reading means for reading the first encryption key; Second reading means for reading the digital information, encryption means for encrypting the first encryption key with a second encryption key, and the first encrypted key and the encrypted (C) receiving the encrypted first encryption key and the encrypted digital information output from the output means. Input means, and the encrypted first An information reproducing apparatus including an encryption key and a decryption unit for decrypting the encrypted digital information; (d) a key generation unit for generating the second encryption key; A key distribution device comprising key distribution means for distributing an encryption key to the information processing device and the information reproduction device.

【０００７】本発明の請求項２に係る著作権保護システ
ムは、前記鍵配送装置の前記鍵生成手段は、前記鍵配送
装置のＩＤ情報と、前記情報処理装置のＩＤ情報と、前
記情報再生装置のＩＤ情報とに基づいて暗号化鍵を生成
するものである。[0007] In a copyright protection system according to a second aspect of the present invention, the key generation means of the key distribution device includes: an ID information of the key distribution device; an ID information of the information processing device; And generates an encryption key based on the ID information.

【０００８】[0008]

【発明の実施の形態】 実施の形態１．本発明による著作権保護システムの一実
施の形態を、図１に基づいて説明する。図１は、本実施
の形態による著作権保護システムの構成図である。図に
おいて、１０１は情報記録媒体、１０２は保護領域、１
０３は通常の領域、１０４は情報処理装置、１０５は第
１の読み取り手段、１０６は第２の読み取り手段、１０
７は暗号化手段、１０８は出力手段、１０９は情報再生
装置、１１０は入力手段、１１１は復号手段、１１２は
鍵配送装置、１１３は鍵生成手段、１１４は鍵配送手段
である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 One embodiment of a copyright protection system according to the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a copyright protection system according to the present embodiment. In the figure, 101 is an information recording medium, 102 is a protected area, 1
03 is a normal area, 104 is an information processing apparatus, 105 is a first reading unit, 106 is a second reading unit,
7 is an encryption unit, 108 is an output unit, 109 is an information reproducing device, 110 is an input unit, 111 is a decryption unit, 112 is a key distribution unit, 113 is a key generation unit, and 114 is a key distribution unit.

【０００９】次に動作を説明する。情報記録媒体１０１
は、例えば、ＤＶＤやＣＤ−ＲＯＭなどの光ディスク
で、情報処理装置１０４は、例えば、光ディスクを読み
取るドライブで、情報再生装置１０９は、例えば、パー
ソナルコンピュータで、鍵配送装置１１２は、例えば、
ＰＣカードやＩＣカードである。まず、情報記録媒体１
０１の記録領域について説明する。情報記録媒体１０１
は、ディジタル情報を記録する領域を２種類に分ける。
一方の領域は、読み取りに特別な手段を必要とする保護
領域１０２で、他の一方の領域は、読み取りに特別な手
段を必要としない通常の領域１０３である。保護領域１
０２に記録された情報は、情報再生装置１０９、例えば
パーソナルコンピュータ上のデバイスドライバ等では読
み取ることができず、情報処理装置１０４の第１の読み
取り手段１０５のみによって情報が読み出され、読み出
された情報は、情報処理装置１０４の外に直接出力する
ことはできない。通常の領域１０３に記録された情報
は、第２の読み取り手段１０６及び出力手段１０８を介
して、情報処理装置１０４の外部に出力することができ
る。通常の領域１０３には、暗号化されたディジタル情
報が記録される。保護領域１０２には、通常の領域１０
３に記録する情報を暗号化する際に用いた第１の暗号化
鍵が記録される。次に、情報処理装置１０４から情報再
生装置１０９へディジタル情報を送信する手順を説明す
る。まず、鍵配送装置１１２内の鍵生成手段１１３にお
いて、第２の暗号化鍵を生成する。生成された第２の暗
号化鍵は、鍵配送手段１１４により情報処理装置１０４
内の暗号化手段１０７、及び情報再生装置１０９内の復
号手段１１１に配送される。次に、情報処理装置１０４
内では、まず、第１の読み取り手段１０５により読み出
された保護領域１０２に記録されている第１の暗号化鍵
を、暗号化手段１０７により、第２の暗号化鍵を用いて
暗号化する。暗号化された第１の暗号化鍵と、第２の読
み取り手段１０６により読み出された暗号化されたディ
ジタル情報を、出力手段１０８を介して情報再生装置１
０９に出力する。次に、情報再生装置１０９内ではま
ず、入力手段１１０を介して、暗号化された第１の暗号
化鍵及び暗号化されたディジタル情報を受信する。次
に、復号手段１１１において、暗号化された第１の暗号
化鍵を、第２の暗号化鍵を用いて復号する。次に、暗号
化されたディジタル情報を、第１の暗号化鍵を用いて復
号する。以上の動作で、情報記録媒体１０１内の通常の
領域１０３に記録されているディジタル情報は、情報再
生装置１０９で再生される。本実施の形態の著作権保護
システムは、情報記録媒体に記録されたディジタル情報
は暗号化されているので、ディジタル情報の不正な複製
を防ぐことができ、著作者の権利を保護することができ
る。Next, the operation will be described. Information recording medium 101
Is, for example, an optical disk such as a DVD or a CD-ROM, the information processing device 104 is, for example, a drive that reads an optical disk, the information reproducing device 109 is, for example, a personal computer,
PC cards and IC cards. First, the information recording medium 1
The recording area No. 01 will be described. Information recording medium 101
Divides an area for recording digital information into two types.
One area is a protected area 102 requiring special means for reading, and the other area is a normal area 103 requiring no special means for reading. Protected area 1
02 cannot be read by the information reproducing apparatus 109, for example, a device driver on a personal computer, and the information is read only by the first reading unit 105 of the information processing apparatus 104, and is read. The information cannot be directly output to the outside of the information processing device 104. The information recorded in the normal area 103 can be output to the outside of the information processing device 104 via the second reading unit 106 and the output unit 108. In the normal area 103, encrypted digital information is recorded. The protection area 102 includes a normal area 10
3, the first encryption key used for encrypting the information to be recorded is recorded. Next, a procedure for transmitting digital information from the information processing device 104 to the information reproducing device 109 will be described. First, a second encryption key is generated by the key generation means 113 in the key distribution device 112. The generated second encryption key is sent to the information processing device 104 by the key distribution unit 114.
And the decryption means 111 in the information reproducing apparatus 109. Next, the information processing device 104
First, the first encryption key recorded in the protection area 102 read by the first reading unit 105 is encrypted by the encryption unit 107 using the second encryption key. . The encrypted first encryption key and the encrypted digital information read by the second reading unit 106 are transmitted to the information reproducing apparatus 1 via the output unit 108.
09 is output. Next, in the information reproducing apparatus 109, first, the encrypted first encryption key and the encrypted digital information are received via the input unit 110. Next, the decrypting means 111 decrypts the encrypted first encryption key using the second encryption key. Next, the encrypted digital information is decrypted using the first encryption key. With the above operation, the digital information recorded in the normal area 103 in the information recording medium 101 is reproduced by the information reproducing device 109. In the copyright protection system according to the present embodiment, since the digital information recorded on the information recording medium is encrypted, unauthorized duplication of the digital information can be prevented, and the rights of the author can be protected. .

【００１０】実施の形態２．前記実施の形態１では、鍵
生成手段１１３において単独に第２の暗号化鍵を生成し
ていたが、情報処理装置１０４、情報再生装置１０９及
び鍵配送装置１１２にそれぞれのＩＤ情報を設け、それ
らのＩＤ情報に基づいて第２の暗号化鍵を生成してもよ
い。Embodiment 2 In the first embodiment, the second encryption key is generated independently by the key generation unit 113. However, each of the information processing device 104, the information reproduction device 109, and the key distribution device 112 is provided with ID information, The second encryption key may be generated based on the ID information.

【００１１】実施の形態３．前記実施の形態１では、暗
号化手段１０７及び復号手段１０９に、鍵配送手段１１
４より同じ暗号化鍵を配送していたが、公開鍵暗号方式
を用いることもできる。Embodiment 3 In the first embodiment, the encryption unit 107 and the decryption unit 109 have the key distribution unit 11
4, the same encryption key has been delivered, but a public key encryption method can also be used.

【００１２】実施の形態４．前記実施の形態１では、情
報再生装置１０９を例えばパーソナルコンピュータとし
ていたが、ＤＶＤプレイヤーなどのオーディオ機器な
ど、ディジタル情報を再生する装置なら何でもよい。ま
た、鍵配送装置１１２には、オーディオ機器のリモコン
装置等を用いることもできる。Embodiment 4 In the first embodiment, the information reproducing device 109 is, for example, a personal computer. However, any device that reproduces digital information, such as an audio device such as a DVD player, may be used. Further, as the key distribution device 112, a remote control device of audio equipment or the like can be used.

【００１３】実施の形態５．前記実施の形態１では、情
報記録媒体１０１は、例えば光ディスクとしていたが、
ディジタル情報を記録する媒体であればよい。Embodiment 5 In the first embodiment, the information recording medium 101 is, for example, an optical disk.
Any medium that records digital information may be used.

【００１４】[0014]

【発明の効果】以上のように、本発明による著作権保護
システムは、ディジタル情報の不正な複製を防ぐことが
でき、著作者の権利を保護することができる効果があ
る。As described above, the copyright protection system according to the present invention has the effects of preventing unauthorized duplication of digital information and protecting the rights of the author.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明の著作権保護システムを説明する図で
ある。FIG. 1 is a diagram illustrating a copyright protection system according to the present invention.

【図２】 従来の光ディスクシステムの構成図である。FIG. 2 is a configuration diagram of a conventional optical disk system.

【符号の説明】[Explanation of symbols]

１０１ 情報記録媒体、１０２ 保護領域、１０３ 通
常の領域、１０４ 情報処理装置、１０５ 第１の読み
取り手段、１０６ 第２の読み取り手段、１０７ 暗号
化手段、１０８ 出力手段、１０９ 情報再生装置、１
１０ 入力手段、１１１ 復号手段、１１２ 鍵配送装
置、１１３ 鍵生成手段、１１４ 鍵配送手段。Reference Signs List 101 information recording medium, 102 protected area, 103 normal area, 104 information processing apparatus, 105 first reading means, 106 second reading means, 107 encryption means, 108 output means, 109 information reproducing apparatus, 1
10 input means, 111 decryption means, 112 key distribution device, 113 key generation means, 114 key distribution means.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 以下の要素を備えた著作権保護システ
ム。 （ａ）情報の読み出しに特別な手段を必要とする保護領
域と、情報の読み出しに特別な手段を必要としない通常
の領域とを設け、前記保護領域には第１の暗号化鍵が記
録され、前記通常の領域には前記第１の暗号化鍵を用い
て暗号化されたディジタル情報が記録された情報記録媒
体； （ｂ）前記第１の暗号化鍵を読み取る第１の読み取り手
段と、前記ディジタル情報を読み取る第２の読み取り手
段と、前記第１の暗号化鍵を第２の暗号化鍵で暗号化す
る暗号化手段と、前記暗号化された第１の暗号化鍵と前
記暗号化されたディジタル情報を出力する出力手段とを
備えた情報処理装置； （ｃ）前記出力手段より出力された、前記暗号化された
第１の暗号化鍵と前記暗号化されたディジタル情報が入
力される入力手段と、前記暗号化された第１の暗号化鍵
と、前記暗号化されたディジタル情報とを復号する復号
手段を備えた情報再生装置； （ｄ）前記第２の暗号化鍵を生成する鍵生成手段と、生
成された前記第２の暗号化鍵を前記情報処理装置と前記
情報再生装置とに配送する鍵配送手段とを備えた鍵配送
装置。1. A copyright protection system comprising the following elements. (A) A protected area that requires special means for reading information and a normal area that does not require special means for reading information are provided, and a first encryption key is recorded in the protected area. An information recording medium in which digital information encrypted using the first encryption key is recorded in the normal area; (b) first reading means for reading the first encryption key; Second reading means for reading the digital information, encryption means for encrypting the first encryption key with a second encryption key, and the first encrypted key and the encrypted (C) receiving the encrypted first encryption key and the encrypted digital information output from the output means. Input means, and the encrypted first An information reproducing apparatus including an encryption key and a decryption unit for decrypting the encrypted digital information; (d) a key generation unit for generating the second encryption key; A key distribution device comprising key distribution means for distributing an encryption key to the information processing device and the information reproduction device. 【請求項２】 前記鍵配送装置の前記鍵生成手段は、前
記鍵配送装置のＩＤ情報と、前記情報処理装置のＩＤ情
報と、前記情報再生装置のＩＤ情報とに基づいて暗号化
鍵を生成することを特徴とする請求項１記載の著作権保
護システム。2. The key generation unit of the key distribution device generates an encryption key based on ID information of the key distribution device, ID information of the information processing device, and ID information of the information reproducing device. The copyright protection system according to claim 1, wherein
JP8151117A 1996-06-12 1996-06-12 Copywrite protection system Pending JPH103746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8151117A JPH103746A (en) 1996-06-12 1996-06-12 Copywrite protection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8151117A JPH103746A (en) 1996-06-12 1996-06-12 Copywrite protection system

Publications (1)

Publication Number Publication Date
JPH103746A true JPH103746A (en) 1998-01-06

Family

ID=15511741

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8151117A Pending JPH103746A (en) 1996-06-12 1996-06-12 Copywrite protection system

Country Status (1)

Country Link
JP (1) JPH103746A (en)

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US7599274B2 (en) 2003-01-23 2009-10-06 Lg Electronics Inc. Recording medium with intermittent or alternate wobbled pits and apparatus and methods for forming, recording, and reproducing the recording medium
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US7339869B2 (en) 2001-09-28 2008-03-04 Matsushita Electric Industrial Co., Ltd. Optical disk and optical method
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JP2004194271A (en) * 2002-10-18 2004-07-08 Toshiba Corp Encryption recording apparatus, reproducing apparatus and program
US7908488B2 (en) 2003-01-23 2011-03-15 Lg Electronics Inc. Recording medium with copy protection information formed in intermittent or alternate wobbled pits and apparatus and methods for forming, recording, and reproducing the recording medium
US7733755B2 (en) 2003-01-23 2010-06-08 Lg Electronics, Inc. Recording medium with optional information and apparatus and methods for forming, recording, reproducing and controlling reproduction of the recording medium
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US8006308B2 (en) 2003-01-23 2011-08-23 Lg Electronics Inc. Recording medium with copy protection indicating information and apparatus and methods for forming, recording, reproducing and restricting reproduction of the recording medium
US7599274B2 (en) 2003-01-23 2009-10-06 Lg Electronics Inc. Recording medium with intermittent or alternate wobbled pits and apparatus and methods for forming, recording, and reproducing the recording medium
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US7917958B2 (en) 2003-01-23 2011-03-29 Lg Electronics Inc. Recording medium with copy protection indicating information and apparatus and methods for forming, recording, reproducing and restricting reproduction of the recording medium
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US8009832B2 (en) 2003-01-24 2011-08-30 Lg Electronics Inc. Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium
US8090103B2 (en) 2003-01-24 2012-01-03 Lg Electronics Inc. Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium
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