JPS61123026A - Preventing device of optical disc copy - Google Patents
Preventing device of optical disc copyInfo
- Publication number
- JPS61123026A JPS61123026A JP24509284A JP24509284A JPS61123026A JP S61123026 A JPS61123026 A JP S61123026A JP 24509284 A JP24509284 A JP 24509284A JP 24509284 A JP24509284 A JP 24509284A JP S61123026 A JPS61123026 A JP S61123026A
- Authority
- JP
- Japan
- Prior art keywords
- pits
- pit
- optical disc
- signal
- pseudo
- 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
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
- G11B20/0092—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors
- G11B20/00927—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors wherein said defects or errors are generated on purpose, e.g. intended scratches
-
- 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
- G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
- G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光ディスクの不法々複製を防止する為の光ディ
スク複゛製防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an optical disc copy prevention device for preventing illegal copying of optical discs.
従来の技術
近年、光ディスクは記録できる情報量が従来の磁気ディ
スクに比べて比較に々らない程の大きさを持っているこ
とから、音声、映像のみならず情報の記録媒体としても
開発が進んできた。Conventional technology In recent years, optical disks have been developed as recording media for not only audio and video but also information, as the amount of information that can be recorded is incomparably greater than that of conventional magnetic disks. did it.
以下に従来の光デイスク再生装置について説明する。A conventional optical disc playback device will be explained below.
第３図は従来の光デイスク再生装置の構成図であり、１
は光学系ピックアップ装置が使用するレーザーの波長λ
のｎ十１／４倍（ｎ＝０、１，２・・・）の深さである
ピットで作られている従来の光ディスク、２はこの従来
の光ディスクを規定の回転速度で回転させる回転装置、
３はレーザーを発生させ上記の従来の光ディスクに光ス
ポットとして照射し反射したレーザーを受ける光学系ピ
ソクアッ３べ７
ブ装置、４は光学系ピックアップ装置で受けだ信号を元
の信号に復調する信号復調装置、５は信号復調装置で復
調された信号出力端子である。FIG. 3 is a block diagram of a conventional optical disc playback device.
is the wavelength λ of the laser used by the optical pickup device
2 is a rotating device that rotates this conventional optical disk at a specified rotational speed. ,
3 is an optical system pickup device that generates a laser, irradiates it as a light spot onto the conventional optical disk mentioned above, and receives the reflected laser; 4 is a signal demodulator that demodulates the received signal to the original signal using an optical pickup device. The device 5 is a signal output terminal demodulated by a signal demodulator.
以上のように構成された光ディスク再成装置について、
以下その動作を説明する。Regarding the optical disc regeneration device configured as above,
The operation will be explained below.
第４図の１１は従来の光デイスク表面のピントを上から
、１２は横から見た図であり、１３は光学系ピックアッ
プ装置が受ける信号の波形図である。In FIG. 4, reference numeral 11 shows the focus on the surface of a conventional optical disk viewed from above, reference numeral 12 shows a view from the side, and reference numeral 13 shows a waveform diagram of a signal received by the optical pickup device.
従来の光ディスク１は、回転装置２により規定の回転速
度で回転される。このディスク１は表面が１１．１２の
ようになっている為、光学系ピックアップ装置３により
１３のような波形の信号を得ることができる。これはピ
ットの深さが使用レーザーの波長λのｎ十１／４倍であ
るので、反射するレーザーがピントの在る場所と無い場
所では干渉により強さが異なるだめである。そして光学
系ピックアップ装置３で得られた信号１３は信号復調装
置４によりディスクに記録される前の元の信号に復調さ
れ信号出力端子５から出力される。A conventional optical disc 1 is rotated by a rotation device 2 at a prescribed rotation speed. Since the surface of this disk 1 is shaped like 11.12, the optical pickup device 3 can obtain a signal with a waveform like 13. This is because the depth of the pit is n11/4 times the wavelength λ of the laser being used, so the intensity of the reflected laser differs between where it is focused and where it is not focused due to interference. The signal 13 obtained by the optical pickup device 3 is demodulated by the signal demodulator 4 into the original signal before being recorded on the disk, and is output from the signal output terminal 5.
発明が解決しようとする問題点
しかしながら上記のような構成では、今後光ディスクの
録再装置の普及に伴い、磁気ディスク等と同様にソフト
の不法な複製がなされる問題点を有している。Problems to be Solved by the Invention However, with the above-described configuration, as optical disk recording/reproducing devices become more widespread in the future, there is a problem in that, similar to magnetic disks, software may be illegally copied.
本発明は上記従来の問題点を解消するもので、光ディス
クに記録されたソフトの不法な複製を防止することので
きる光デイスク複製防止装置を提供することを目的とす
る。The present invention solves the above-mentioned conventional problems, and aims to provide an optical disk duplication prevention device that can prevent illegal duplication of software recorded on an optical disk.
問題点を解決するだめの手段
本発明は、光ピツクアップ装置が使用するレーザーの波
長λのｎ十１／４倍（ｎ＝０、１．２・・・）の深さで
ある真ピットと波長λのｎ十１／４倍以外の適度な深さ
である擬ピットの２種類のピットで作られている光ディ
スクと、この光ディスクを規定の回転速度で回転させる
回転装置と、レーザーを発生させ上記の光ディスクに光
スポットとして照射し反射したレーザーを受ける光学系
ピックアップ装置と、光学系ピンクアンプ装置が上記の
光ディスクの擬ピント上で反射したレーザーを受けた際
５ペーノ
にピットの有無を判別し、また擬ピットが有るべき位置
に擬ピットが無ければ、光学系ピックアップ装置からの
出力を変形させてしまう擬ピント判別装置と、擬ピット
判別装置により補正された信号を」＝記の光ディスクに
記録する前の元の信号に復調する信号復調装置とを備え
た光ディ゛スク複製防止装置である。Means for Solving the Problems The present invention provides a method for detecting a true pit whose depth is n11/4 times (n=0, 1.2...) the wavelength λ of the laser used by the optical pickup device, and the wavelength λ. An optical disc made of two types of pseudo pits with a moderate depth other than n11/4 times λ, a rotating device that rotates this optical disc at a specified rotational speed, and a laser generator that generates the above-mentioned An optical pickup device receives the reflected laser beam that is irradiated as a light spot on the optical disk, and an optical pink amplifier device determines the presence or absence of a pit in the 5 peno when the optical disk receives the laser beam reflected on the pseudo focus of the optical disk, In addition, if there is no pseudo pit at the position where the pseudo pit should be, the signal corrected by the pseudo focus discriminator and the pseudo pit discriminator, which distorts the output from the optical pickup device, is recorded on the optical disc. The present invention is an optical disk copy prevention device comprising a signal demodulator for demodulating the previous original signal.
作用
本発明によれば、光ディスクに光学系ピックアップ装置
が使用するレーザーの波長λのｎ十１／４倍（ｎ＝０、
１．２・・・）以外の適度な深さである擬ピットを設け
、また擬ピットの位置及びその判別に関したデータを含
ませ、そしてこの光ディスクに対応するための擬ピット
判別装置を設けることにより、光ディスクに記録された
ソフトの不法な複製を防止することができるものである
。According to the present invention, the wavelength λ of the laser used by the optical pickup device for the optical disc is n11/4 times (n=0,
1.2) Provide pseudo pits with an appropriate depth other than (2...), include data regarding the position of the pseudo pits and their discrimination, and provide a pseudo pit discrimination device for this optical disc. This makes it possible to prevent illegal copying of software recorded on optical discs.
実施例
第１図は本発明の一実施例における光デイスク複製防止
装置の構成を示すものである。Embodiment FIG. 1 shows the configuration of an optical disk duplication prevention device in an embodiment of the present invention.
第１図において、２１は光学系ピックアップ装６ ペー
ジ
置が使用するレーザーの波長λのｎ十１／４倍（ｎ−０
，１，２・・・）の深さである真ピットと波長λのｎ十
１／４倍以外の適度な深さである擬ピントの２種類のピ
ントで作られている光ディスク、２２はこの光ディスク
を規定の回転速度で回転させる回転装置、２３はレーザ
ーを発生させ上記の光ディスクに光スポットとして照射
し反射したレーザーを受けとる光学系ピックアップ装置
、２４は光学系ピンクアップ装置が光ディスクの擬ピッ
ト上で反射したレーザーを受けた際にピットの有無を判
別し、また擬ピットが有るべき位置に擬ピントが無けれ
ば光学系ピックアップ装置からの出力波形を変形させて
しまう疑ピット判別装置、２５は擬ピット判別装置によ
り補正された信号を光ディスクに記録する前の元の信号
に復調する信号復調装置、２６は信号復調装置で復調さ
れた信号出力である。In FIG. 1, 21 is the optical system pickup device 6. The wavelength λ of the laser used by the page device is n1/4 times (n-0
, 1, 2...), and a pseudo-focus, which is an appropriate depth other than n11/4 times the wavelength λ, 22 is this optical disc. A rotation device that rotates the optical disk at a specified rotation speed; 23 an optical pickup device that generates a laser, irradiates the optical disk as a light spot, and receives the reflected laser; 24 an optical pink-up device that generates a laser beam on the pseudo pit of the optical disk; 25 is a pseudo pit discriminator that determines the presence or absence of a pit when it receives a laser reflected from a A signal demodulator 26 demodulates the signal corrected by the pit discrimination device into the original signal before being recorded on the optical disc, and 26 is a signal output demodulated by the signal demodulator.
以上のように構成された本実施例の光デイスク複製防止
装置について、以下その動作を説明する。The operation of the optical disc duplication prevention device of this embodiment configured as described above will be described below.
第２図の３１８，３１ｂは光デイスク表面のピットを上
から、３２ａ 、３２ｂは横から見た図で７、−１−
あり、３１ ａ 、３２ａはλのｎ十１／４倍の深さの
真ピッ）、３１ ｂ 、３２ｂはλのｎ十１／４倍以外
の適度な深さの擬ピントである。また３３は光学系ピッ
クアップ装置２３が受ける信号の波形図である。In Fig. 2, 318 and 31b are views of the pits on the surface of the optical disk from above, and 32a and 32b are views from the side. , 31 b and 32 b are pseudo-focuses with appropriate depths other than n11/4 times λ. Further, 33 is a waveform diagram of a signal received by the optical pickup device 23.
光ディスク２１は回転装置２２により規定の回転速度で
回転される。光学系ピックアップ装置２３は光ディスク
２１を読み取り３３のような信号を得る。この信号が得
られる理由は先の従来例で示したが、３３の信号の場合
は３３ｂの部分の擬ピットによる信号の部分、つまりλ
のｎ十１／４倍以外の適度な深さの擬ピットによるレー
ザーの干渉による信号の部分と３３ａの真ピットによる
信号の部分とに区別できる信号である。３３ｂの信号が
現われたときに擬ピット判別装置２４は光ディスクに記
録されている擬ピットの位置及びその判別に関するソフ
トデータに従い、擬ピントの部分をピット有とするか無
とするか判別し、補正した信号を信号復調装置２６に送
る。そしてディスク２１に記録する前の元の信号が端子
２６から得られる。The optical disc 21 is rotated by a rotating device 22 at a prescribed rotational speed. The optical pickup device 23 reads the optical disc 21 and obtains a signal such as 33. The reason why this signal is obtained was shown in the previous conventional example.
The signal can be distinguished into a signal portion due to laser interference due to pseudo pits having a depth other than n11/4 times as large as n1/4, and a signal portion due to true pits 33a. When the signal 33b appears, the pseudo pit discriminating device 24 determines whether the pseudo-focus area has a pit or does not have a pit, and makes corrections according to the software data regarding the pseudo pit position and its discrimination recorded on the optical disc. The resulting signal is sent to the signal demodulator 26. The original signal before being recorded on the disk 21 is then obtained from the terminal 26.
端子２６からの出力信号は書ピット判別装置２４にも送
られ、擬ピット判別装置２４は光ディスクに記録されて
いる擬ピットの位置及びその判別に関するソフトデータ
を得る。また擬ピット判別装置２４は擬ピントを判別、
補正するだけでなく、擬ピットの位置及びその判別に関
するソフトデ−タに従って擬ピントが有るべき位置に擬
ピットが無ければ、光学系ピンクアップ装置２３がらの
出力を変形させて信号ゆ調装置２５に出力し、復調不能
とさせる。The output signal from the terminal 26 is also sent to the write pit discriminator 24, and the pseudo pit discriminator 24 obtains software data regarding the positions of pseudo pits recorded on the optical disc and their discrimination. Further, the pseudo pit discrimination device 24 discriminates pseudo focus,
In addition to correction, if there is no pseudo pit at the position where the pseudo focus should be according to the software data regarding the position of the pseudo pit and its discrimination, the output from the optical system pink-up device 23 is modified and sent to the signal distortion device 25. output, making it impossible to demodulate.
以上のように本実施例によれば、単に信号出方を別の光
ディスクに複製しても、その光ディスクは正常な動作を
しない。しかも一般に普及する光デイスク用記録装置ま
だは録再装置は擬ピットを記録することは困難である。As described above, according to this embodiment, even if the signal output method is simply duplicated on another optical disc, that optical disc will not operate normally. Moreover, it is difficult for recording and reproducing apparatuses to record pseudo pits, even though they are not yet widely used as recording devices for optical discs.
逆に擬ピントの位置及びその判別に関するソフトデータ
を含む原盤から擬ピット付の光ディスクを作成するのは
容易である。Conversely, it is easy to create an optical disc with pseudo pits from a master disc that includes software data regarding the pseudo focus position and its determination.
このように光ディスクに擬ピッｉ・を設け、また擬ピッ
トの位置及びその判別に関したデータを含ませ、そして
この光ディスクに対応するだめの擬９ ぺ−）゛
ピット判別装置を設けることにより、光ディスクに記録
されたソフトの不法な複製を防止することができる。In this way, by providing pseudo pits on an optical disc, including data regarding the position and discrimination of the pseudo pits, and providing a pseudo pit discriminating device corresponding to this optical disc, it is possible to It is possible to prevent illegal copying of software recorded on the computer.
発明の効果
本発明は光ディスクに擬ピットを設け、また疑ピットの
位置及びその判別に関したデータを含ませ、そしてこの
光ディスクに対応するだめの擬ピント判別装置を設ける
ことにより、光ディスクに記録されたソフトの不法な複
製を防止することができる優れた光デイスク複製防止装
置を実現できるものである。Effects of the Invention The present invention provides pseudo pits on an optical disc, includes data regarding the position of the pseudo pits and their discrimination, and provides a corresponding pseudo focus discriminating device for this optical disc, so that data can be recorded on the optical disc. It is possible to realize an excellent optical disk duplication prevention device that can prevent illegal duplication of software.
第１図は本発明の一実施例における光デイスク複製防止
装置のブロック図、第２図は同実施例の光ディスクのピ
ットから得られる信号波形図、第３図は従来の光デイス
ク再生装置の構成図、第４図は従来の光ディスクのピッ
トから得られる信号波形図である。
２１・・・・・・光ディスク、２２・・・・・・回転装
置、２３・・・・・・光学系ピックアップ装置、２４・
・・・・・擬ピット１ｏ ベージ
・ 判別装置、２６・・・・・信号復調装置、２６・・
・・・・信号出力端子、３１ ａ 、３２ａ・・・・・
・真ピット、３１ｂ。
３２ｂ・・・・・・擬ヒツト。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名°ゝ
、、＋１
第１図
？！／
第２図
第３図
第４図FIG. 1 is a block diagram of an optical disc duplication prevention device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram obtained from pits of an optical disc according to the same embodiment, and FIG. 3 is a configuration of a conventional optical disc playback device. 4 are signal waveform diagrams obtained from the pits of a conventional optical disc. 21... Optical disc, 22... Rotating device, 23... Optical pickup device, 24...
...Pseudo pit 1o page discrimination device, 26...Signal demodulation device, 26...
...Signal output terminal, 31a, 32a...
・Shin Pit, 31b. 32b...Pseudo human. Name of agent: Patent attorney Toshio Nakao and 1 other person °ゝ ,,+1 Figure 1? ! / Figure 2 Figure 3 Figure 4
Claims (1)
ｎ＋１／４倍（ｎ＝０、１、２……）の深さである真ピ
ットと前記波長λのｎ＋１／４倍以外の深さである擬ピ
ットの２種類のピットで作られている光ディスクと、こ
の光ディスクを規定の回転速度で回転させる回転装置と
、前記レーザーを発生させ前記の光ディスクに光スポッ
トとして照射し反射したレーザーを受ける光学系ピック
アップ装置と、前記光学系ピックアップ装置が前記光デ
ィスクの擬ピット上で反射したレーザーを受けた際にピ
ットの有無を判別し、また擬ピットが有るべき位置に擬
ピットが無ければ光学系ピックアップ装置からの出力を
変形させてしまう擬ピット判別装置と、前記擬ピット判
別装置により補正された信号を前記光ディスクに記録す
る前の元の信号に復調する信号復調装置とを備えたこと
を特徴とする光ディスク複製防止装置。The true pit has a depth of n+1/4 times (n=0, 1, 2...) the wavelength λ of the laser used by the optical pickup device, and the pseudo pit has a depth other than n+1/4 times the wavelength λ. An optical disc made of two types of pits, a rotating device that rotates this optical disc at a specified rotational speed, and an optical pickup that generates the laser, irradiates the optical disc as a light spot, and receives the reflected laser. When the optical pickup device receives the laser reflected on the pseudo pits of the optical disk, it determines the presence or absence of pits, and if there are no pseudo pits at the positions where the pseudo pits should be, the optical pickup device detects the presence of pits. An optical disc duplication comprising: a pseudo pit discriminator that transforms the output; and a signal demodulator that demodulates the signal corrected by the pseudo pit discriminator to the original signal before being recorded on the optical disc. Prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24509284A JPS61123026A (en) | 1984-11-20 | 1984-11-20 | Preventing device of optical disc copy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24509284A JPS61123026A (en) | 1984-11-20 | 1984-11-20 | Preventing device of optical disc copy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61123026A true JPS61123026A (en) | 1986-06-10 |
Family
ID=17128481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24509284A Pending JPS61123026A (en) | 1984-11-20 | 1984-11-20 | Preventing device of optical disc copy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61123026A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0298691A2 (en) * | 1987-07-08 | 1989-01-11 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for protection of signal copy |
| WO1994024665A1 (en) * | 1993-04-08 | 1994-10-27 | Sonopress Produktionsgesellschaft für Ton- und Informationsträger mbH | Disk-shaped optical storage medium and process for producing the same |
| EP0703576A1 (en) * | 1994-09-22 | 1996-03-27 | Victor Company Of Japan, Limited | Optical disc, device for checking optical disc, and device for recording information on optical disc |
| US5724327A (en) * | 1991-12-02 | 1998-03-03 | U.S. Phillips Corporation | Record carrier having first variations of a first physical parameter corresponding to information recorded thereon and second variations of a second physical parameter relating to recovery of the information |
| EP0930614A1 (en) * | 1991-12-02 | 1999-07-21 | Koninklijke Philips Electronics N.V. | "Closed information system with physical copy protection" |
| EP1012836A1 (en) * | 1997-09-10 | 2000-06-28 | WEA Manufacturing, Inc. | Dual data recorded compact disc |
| EP1117095A2 (en) * | 2000-01-14 | 2001-07-18 | Pioneer Corporation | Recordable optical disc, and method of recording data on the same |
| US6507557B1 (en) | 1999-03-25 | 2003-01-14 | Victor Company Of Japan, Ltd. | Optical recording medium and recording method therefor |
| AU2003202506B2 (en) * | 1997-09-10 | 2006-07-06 | Wea Manufacturing Inc. | Dual data recorded compact disc |
| NL1017631C2 (en) * | 2000-04-03 | 2007-07-03 | Hewlett Packard Co | Protection against copying of optical discs. |
-
1984
- 1984-11-20 JP JP24509284A patent/JPS61123026A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4979210A (en) * | 1987-07-08 | 1990-12-18 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for protection of signal copy |
| EP0298691A2 (en) * | 1987-07-08 | 1989-01-11 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for protection of signal copy |
| US5724327A (en) * | 1991-12-02 | 1998-03-03 | U.S. Phillips Corporation | Record carrier having first variations of a first physical parameter corresponding to information recorded thereon and second variations of a second physical parameter relating to recovery of the information |
| KR100268621B1 (en) * | 1991-12-02 | 2000-10-16 | 요트.게.아. 롤페즈 | Closed information system with physical copy protection |
| EP0930614A1 (en) * | 1991-12-02 | 1999-07-21 | Koninklijke Philips Electronics N.V. | "Closed information system with physical copy protection" |
| US5737286A (en) * | 1991-12-02 | 1998-04-07 | U.S. Philips Corporation | System and apparatus for recovering information from a record currier which exhibits variations of two different physical parameters thereof |
| AU671740B2 (en) * | 1993-04-08 | 1996-09-05 | Sonopress Produktionsgesellschaft Fur Ton- Und Informationstrager Mbh | Disk-shaped optical storage medium and process for producing the same |
| WO1994024665A1 (en) * | 1993-04-08 | 1994-10-27 | Sonopress Produktionsgesellschaft für Ton- und Informationsträger mbH | Disk-shaped optical storage medium and process for producing the same |
| US5572507A (en) * | 1994-09-22 | 1996-11-05 | Victor Company Of Japan, Ltd. | Optical disc, device for checking optical disc, and device for recording information on optical disc |
| EP0703576A1 (en) * | 1994-09-22 | 1996-03-27 | Victor Company Of Japan, Limited | Optical disc, device for checking optical disc, and device for recording information on optical disc |
| EP1012836A1 (en) * | 1997-09-10 | 2000-06-28 | WEA Manufacturing, Inc. | Dual data recorded compact disc |
| EP1012836A4 (en) * | 1997-09-10 | 2001-02-07 | Wea Mfg Inc | Dual data recorded compact disc |
| AU2003202506B2 (en) * | 1997-09-10 | 2006-07-06 | Wea Manufacturing Inc. | Dual data recorded compact disc |
| US6507557B1 (en) | 1999-03-25 | 2003-01-14 | Victor Company Of Japan, Ltd. | Optical recording medium and recording method therefor |
| EP1117095A2 (en) * | 2000-01-14 | 2001-07-18 | Pioneer Corporation | Recordable optical disc, and method of recording data on the same |
| EP1117095A3 (en) * | 2000-01-14 | 2002-11-27 | Pioneer Corporation | Recordable optical disc, and method of recording data on the same |
| NL1017631C2 (en) * | 2000-04-03 | 2007-07-03 | Hewlett Packard Co | Protection against copying of optical discs. |
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