JPH0785574A - Optical recording medium and reproducing device therefor - Google Patents
Optical recording medium and reproducing device thereforInfo
- Publication number
- JPH0785574A JPH0785574A JP5177537A JP17753793A JPH0785574A JP H0785574 A JPH0785574 A JP H0785574A JP 5177537 A JP5177537 A JP 5177537A JP 17753793 A JP17753793 A JP 17753793A JP H0785574 A JPH0785574 A JP H0785574A
- Authority
- JP
- Japan
- Prior art keywords
- data
- key information
- recorded
- recording medium
- optical
- 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
Landscapes
- Storage Device Security (AREA)
- Television Signal Processing For Recording (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、収録された情報が他の
媒体に容易にコピーできない光ディスク及びその再生装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc in which recorded information cannot be easily copied onto another medium and a reproducing apparatus therefor.
【０００２】[0002]
【従来の技術】従来より、音楽情報を収録したＣＤや、
プログラムソフト或いはデータベース等を記録したＣＤ
−ＲＯＭ等の再生専用型光ディスクや、光ディスク上に
１回だけデータを記録することが可能な追記型光ディス
ク（Ｗ０）や、何回でも書き換えが可能な書換型光ディ
スク（ＭＯ等）が存在する。そして、再生専用型光ディ
スクに記録されたデータを読み出し、例えば追記型光デ
ィスクにそのデータを記録することは、極めて容易に行
うことができ、更に、再生専用型光ディスクに収録され
た音楽やプログラムソフト或いはデータベース等をコピ
ーから保護する方法も殆どとられていないのが現状であ
る。このため、オリジナルのＣＤやＣＤ−ＲＯＭに対す
る違法コピ−も簡単に行うことができる。2. Description of the Related Art Conventionally, a CD containing music information,
CD with program software or database recorded
There are read-only optical discs such as ROMs, write-once optical discs (W0) that can record data on the optical discs only once, and rewritable optical discs (MO and the like) that can be rewritten any number of times. Then, it is extremely easy to read out the data recorded on the read-only optical disc and record the data on the write-once optical disc, and further, the music or program software recorded on the read-only optical disc or At present, there is almost no method for protecting a database or the like from copying. Therefore, it is possible to easily make an illegal copy to the original CD or CD-ROM.
【０００３】そこで、高価な一部のソフトウエアでは、
ハードウエアキーの外部への追加や、キーディスクと呼
ばれるコピー防止のための特別なデータディスクを添付
する等して違法コピーを防止する対策を取っているもの
もあった。Therefore, in some expensive software,
Some have taken measures to prevent illegal copying, such as adding a hardware key to the outside or attaching a special data disk called a key disk for copy protection.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上述のよう
なハードウエアキーや、キーディスクを用いた違法コピ
ーの防止方法では、ソフトウエアを供給する媒体と、コ
ピー防止のためのハードウエアキーや、キーディスクと
が必要になるため、ソフトウエアのコストが高くなり、
また、ハードウエアキーや、キーディスクの損傷や、消
失などによりソフトウエアが利用不可能になる等、正規
ユーザへの負担が大きい。By the way, in the method for preventing illegal copying using the above hardware key or key disk, a medium for supplying software, a hardware key for preventing copying, Since a key disk is required, the cost of software increases,
Further, the software becomes unusable due to damage or loss of the hardware key or the key disk, which imposes a heavy burden on the authorized user.
【０００５】そこで、本発明は上記の点に着目してなさ
れたものであり、ソフトウエアや音楽情報を供給する光
ディスクのコストアップをせずに、コピー防止を行うこ
とを目的とするものである。Therefore, the present invention has been made by paying attention to the above points, and an object thereof is to prevent copy without increasing the cost of an optical disk for supplying software and music information. .
【０００６】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するための手段として、暗号化されたデジタル信号デ
ータがデータ記録領域に記録された光記録媒体であっ
て、前記デジタル信号データを復号するための復号化方
法を決定するキー情報を前記光記録媒体上の前記データ
記録領域以外の予め定められた位置に記録したことを特
徴とする光記録媒体を提供しようとするものである。As a means for achieving the above object, the present invention provides an optical recording medium in which encrypted digital signal data is recorded in a data recording area, wherein the digital signal data is stored in the optical recording medium. It is an object of the present invention to provide an optical recording medium characterized in that key information for determining a decoding method for decoding is recorded in a predetermined position other than the data recording area on the optical recording medium.
【０００７】また、本発明は、上記目的を達成するため
の手段として、暗号化されたデジタル信号データをデー
タ記録領域に記録し、前記デジタル信号データを復号す
るための復号化方法を決定するキー情報を前記光記録媒
体上の前記データ記録領域以外の予め定められた位置に
記録した光記録媒体を再生する再生装置であって、前記
光記録媒体のデータ記録領域に記録されたデジタル信号
データを読み取るためのデータ読取手段と、前記光記録
媒体上に記録されたキー情報を読み取るためのキー情報
読取り手段と、前記キー情報読取手段により読み取られ
たキー情報により復号化方法を決定し、この決定された
復号化方法を用いて前記データ読取り手段により読み出
されたデジタル信号データを復号化する復号化手段とを
備えことを特徴とする再生装置を提供しようとするもの
である。As a means for achieving the above object, the present invention is a key for recording encrypted digital signal data in a data recording area and determining a decryption method for decrypting the digital signal data. A reproducing device for reproducing an optical recording medium in which information is recorded at a predetermined position other than the data recording area on the optical recording medium, wherein the digital signal data recorded in the data recording area of the optical recording medium is recorded. The data reading means for reading, the key information reading means for reading the key information recorded on the optical recording medium, and the decoding method are determined by the key information read by the key information reading means, and this determination is made. And a decoding means for decoding the digital signal data read by the data reading means by using the decoding method described above. That it is intended to provide a reproducing apparatus.
【０００８】[0008]
【実施例】以下、添付図面を参照して本発明の実施例を
説明する。最初に、本発明の光ディスクの信号記録方法
を図１に示す記録装置を用いて説明する。図１は、本発
明の一実施例の光ディスクにデータを記録するための記
録装置の概略構成図である。同図に示す記録装置１にお
いて、２は光ディスク２であり、再生装置や記録装置の
光ヘッドが走査可能な範囲内に形成されたデータ記録領
域３に、音楽情報やソフトウエア等のデータが記録され
る。また、光ディスク２上のデータ記録領域３以外の部
分、即ち、再生装置や記録装置の光ヘッドが走査不可能
な部分は非データ記録領域４であり、データ記録領域３
と反対面に形成したレーベル記録面や、光ディスクの中
心穴からデータ記録領域３まで或いはデータ記録領域３
から光ディスク外周端面部までが含まれる。また、５は
キー情報に基づき原データを暗号化する暗号化手段５で
あり、６は暗号化手段５により原データを暗号化して生
成した主データを光ディスク２のデータ記録領域３に記
録するための主データ記録手段６であり、７は上記キー
情報を光ディスク２の上記非データ記録領域４に記録す
るためのキー情報記録手段７である。Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a signal recording method for an optical disc of the present invention will be described using the recording device shown in FIG. FIG. 1 is a schematic configuration diagram of a recording device for recording data on an optical disc according to an embodiment of the present invention. In the recording apparatus 1 shown in the figure, reference numeral 2 is an optical disc 2, and data such as music information and software is recorded in a data recording area 3 formed within a range that can be scanned by an optical head of the reproducing apparatus or the recording apparatus. To be done. Further, a portion other than the data recording area 3 on the optical disc 2, that is, a portion where the optical head of the reproducing device or the recording device cannot scan is the non-data recording area 4, and the data recording area 3
The label recording surface formed on the opposite surface to the data recording area 3 from the center hole of the optical disk to the data recording area 3
To the outer peripheral edge surface of the optical disk. Further, 5 is an encryption means 5 for encrypting the original data based on the key information, and 6 is for recording the main data generated by encrypting the original data by the encryption means 5 in the data recording area 3 of the optical disc 2. Is a main data recording means 6 and 7 is a key information recording means 7 for recording the key information in the non-data recording area 4 of the optical disc 2.
【０００９】次に上記記録装置１の動作に付いて説明す
る。暗号化手段５に音楽情報やプログラム等の原データ
（従来の光ディスクに記録されるようなデジタル信号デ
ータ）を入力すると、暗号化手段５ではキー情報を用い
て原データを暗号化する。この暗号化の方法としては、
例えば、原データを数ビットずつのグループに分け、そ
のグループ内で各ビットを数ビットずつ右或いは左にシ
フトさせるようなものが考えられる。また、この暗号化
方法の内、暗号化手段５には、原データを数ビットずつ
のグループに分け、そのグループ内で各ビットを数ビッ
トずつ右或いは左にシフトさせるという暗号化のための
暗号化規則を予め設定しておき、そして、キー情報によ
り何ビットのグループに分けさせるのか、或いは何ビッ
トシフトさせるのかという定数的な情報を与えるように
する。このように暗号化手段５では、キー情報を用いて
原データを暗号化して主データを生成し、主データ記録
手段６へ出力する。この主データが入力された主データ
記録手段６では、従来の光ディスク２にデータを記録す
るのと同様に光ディスク２のデータ記録領域３へ記録す
る。また、上記キー情報は、暗号化手段５と共にキー情
報記録手段７へも入力される。このキー情報記録手段７
では、キー情報を光ディスク２の非データ記録領域４へ
記録する。Next, the operation of the recording apparatus 1 will be described. When original data such as music information or a program (digital signal data as recorded on a conventional optical disc) is input to the encryption means 5, the encryption means 5 encrypts the original data using the key information. As for this encryption method,
For example, it is conceivable that the original data is divided into groups of several bits and each bit is shifted to the right or left by several bits in the group. Also, in this encryption method, the encryption means 5 divides the original data into groups of several bits and shifts each bit to the right or left by several bits in the group. The conversion rule is set in advance, and constant information about how many bits to divide into groups or how many bits to shift by key information is given. Thus, the encryption means 5 encrypts the original data using the key information to generate main data, and outputs the main data to the main data recording means 6. In the main data recording means 6 to which this main data is input, the data is recorded in the data recording area 3 of the optical disc 2 as in the case of recording data on the conventional optical disc 2. The key information is also input to the key information recording means 7 together with the encryption means 5. This key information recording means 7
Then, the key information is recorded in the non-data recording area 4 of the optical disc 2.
【００１０】以上のようにして、キー情報と、キー情報
に基づき暗号化された主データが記録された光ディスク
２を作成することが可能になる。このように作成された
光ディスク２は、原データから主データへの暗号化方法
が解読されなければ、主データから原データを生成する
ことができない。なお、暗号化方法が複雑であるほど、
その復号化方法を解読することが難しくなるので、収録
されたデータを悪質な違法コピーから保護する効果が高
くなるのは勿論である。また、キー情報により上記暗号
化規則から暗号化方法を決定するようにしたので、光デ
ィスク２上のキー情報がコピーされない限り原データを
再生することが不可能になる。As described above, the optical disc 2 on which the key information and the main data encrypted based on the key information are recorded can be produced. In the optical disc 2 thus created, the original data cannot be generated from the main data unless the encryption method from the original data to the main data is decrypted. The more complicated the encryption method,
Since it becomes difficult to decipher the decryption method, it goes without saying that the effect of protecting the recorded data from malicious illegal copying becomes high. Further, since the encryption method is determined from the above encryption rule based on the key information, the original data cannot be reproduced unless the key information on the optical disc 2 is copied.
【００１１】また、以上説明した記録装置１による光デ
ィスク２への信号記録方法は、ＣＤやＣＤ−ＲＯＭの製
造工程において記録原盤を作成する工程に使用可能であ
る。このように作成された記録原盤により、従来と同様
な工程により光ディスクを製造することができる。The signal recording method on the optical disc 2 by the recording device 1 described above can be used in the step of producing a recording master in the manufacturing process of a CD or a CD-ROM. An optical disc can be manufactured by the same process as that of the conventional method by using the recording master thus created.
【００１２】次に、上記光ディスク２を再生する再生装
置１１に付いて説明する。図２は、本発明の一実施例の
光ディスクを再生するための再生装置の概略構成図であ
る。同図において１１は光ディスク２から情報を再生す
るための再生装置１１であり、光ディスク２のデータ記
録領域３から上記主データを読取るための主データ読取
り手段８と、上記キー情報を光ディスク２の上記非デー
タ記録領域４から読取るためのキー情報読取り手段９
と、キー情報に基づき主データを復号化して上記原デー
タを再生するする復号化手段１０とより成る。Next, the reproducing apparatus 11 for reproducing the optical disc 2 will be described. FIG. 2 is a schematic configuration diagram of a reproducing apparatus for reproducing an optical disc according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a reproducing device 11 for reproducing information from the optical disc 2, a main data reading means 8 for reading the main data from the data recording area 3 of the optical disc 2, and the key information for the optical disc 2 described above. Key information reading means 9 for reading from the non-data recording area 4
And a decoding means 10 for reproducing the original data by decoding the main data based on the key information.
【００１３】次に、再生装置１１の動作に付いて説明す
る。最初に、光ディスク２に記録されたキー情報がキー
情報読取り手段９により読み取られ、復号化手段１０へ
出力される。キー情報が入力された復号化手段１０で
は、まず、キー情報により、復号化方法を決定する。こ
こで、復号化手段１０には上記暗号化された主データを
復号するための復号化規則が設定されている。それは例
えば、主データをａグループに分け、そのグループ内の
各ビットをｂビットずつｃ（右または左）にシフトする
というようなものである。この復号化規則に、上記入力
されたキー情報によりａ＝４、ｂ＝１ｃ＝右を当てはめ
ることで、復号化方法が決定される。次に、復号化手段
１０で復号化方法が決定すると、主データ読取り手段８
により、光ディスク２のデータ記録領域３に記録された
主データが読み取られ、この読み取られた主データが復
号化手段１０へ出力される。主データが入力された復号
化手段１０では、入力される主データを上記決定された
復号化方法に基づき復号し、原データを生成して出力す
る。なお、例えば違法コピーにより、主データのみがコ
ピーされた光ディスク２を再生しても、復号化を決定す
るためのキー情報が光ディスク２上の予め定められた位
置に記録されていなければ原データを復号することがで
きない。Next, the operation of the reproducing apparatus 11 will be described. First, the key information recorded on the optical disc 2 is read by the key information reading means 9 and output to the decoding means 10. In the decryption means 10 to which the key information is input, first, the decryption method is determined by the key information. Here, the decryption means 10 is provided with a decryption rule for decrypting the encrypted main data. For example, the main data is divided into a group, and each bit in the group is shifted by b bits to c (right or left). The decryption method is determined by applying a = 4 and b = 1c = right to the decryption rule according to the input key information. Next, when the decoding method is determined by the decoding means 10, the main data reading means 8
Thereby, the main data recorded in the data recording area 3 of the optical disc 2 is read, and the read main data is output to the decoding means 10. The decoding means 10 to which the main data is input decodes the input main data based on the above-described determined decoding method to generate and output the original data. Even if the optical disc 2 on which only the main data is copied is reproduced by illegal copying, for example, if the key information for determining the decryption is not recorded at a predetermined position on the optical disc 2, the original data is recorded. Cannot be decrypted.
【００１４】ところで、上記光ディスク２において非デ
ータ記録領域４に記録されるキー情報を、一般ユーザが
容易にコピーできないようにする必要がある。また、耐
久性等の点からもその記録位置に付いては十分に検討す
る必要がある。そこで次にキー情報を記録した光ディス
クの実施例について説明する。By the way, it is necessary to prevent general users from easily copying the key information recorded in the non-data recording area 4 of the optical disc 2. Also, from the viewpoint of durability and the like, it is necessary to thoroughly consider the recording position. Therefore, an embodiment of the optical disc in which the key information is recorded will be described next.
【００１５】図３に示す光ディスク２は、ＣＤ又はＣＤ
−ＲＯＭ等の構造を示し、通常は同図に示すように領域
Ａに反射膜を有する。この領域Ａには、上記データ記録
領域３である領域Ｂと、製造管理上の原盤番号２２や、
識別コード（幾何学模様やバーコード等）２３等が記録
された領域Ｃとが形成されている。ところで、この領域
Ｃは、再生装置の光ヘッドが走査しない部分であるた
め、この領域Ｃに記録されている情報については再生装
置による読み出しができない。そこで、この領域Ｃに上
記キー情報を記録し、再生装置に領域Ｃに記録されたキ
ー情報を読み取ることができる上記キー情報読取り手段
９を設ければ、上述の光ディスク２及び再生装置１１を
提供することができる。The optical disc 2 shown in FIG. 3 is a CD or a CD.
-Shows a structure such as a ROM, and usually has a reflective film in an area A as shown in the figure. In the area A, the area B which is the data recording area 3, the master number 22 in manufacturing management,
An area C in which an identification code (geometric pattern, barcode, etc.) 23 and the like are recorded is formed. By the way, since the area C is a portion where the optical head of the reproducing apparatus does not scan, the information recorded in the area C cannot be read by the reproducing apparatus. Therefore, by providing the key information reading means 9 capable of recording the key information in the area C and reading the key information recorded in the area C in the reproducing apparatus, the optical disc 2 and the reproducing apparatus 11 are provided. can do.
【００１６】キー情報記録の一例としては、領域Ｃの原
盤番号２２や、識別コード２３等が記録されていない場
所に、上記識別コード２３と同様な幾何学模様やバーコ
ード等でキー情報を記録することが考えられる。また、
再生装置１１のキー情報読取り手段９は、発光素子と受
光素子による光学的読取り手段を、光ディスク２に記録
されたキー情報を読み取ることが可能な予め定められた
位置に設ける。ここで、上記キー情報は、上記復号化方
法を決定するための定数的な情報だけであり、その情報
量は少ないものであるため、幾何学模様や、バーコード
は精細度を必要としない。したがって、キー情報読取り
手段９は、簡単なハードウエア構成で実現可能である。
また、光ディスク２の領域Ｃにキー情報を書き込むよう
にすれば、光ディスク２の製造時にキー情報を記録する
ための特別な成形金型を用いる必要がなくなり、製造工
程の増加を最小限とすることができ、光ディスク２のコ
ストアップも最小限に抑えることができる。更に、キー
情報が保護膜で覆われるため、キー情報が読取り不可能
になる確率も非常に低くなる。As an example of the key information recording, the key information is recorded in the area C where the master disc number 22 and the identification code 23 are not recorded by the same geometric pattern as the identification code 23 or the bar code. It is possible to do it. Also,
The key information reading means 9 of the reproducing apparatus 11 is provided with an optical reading means including a light emitting element and a light receiving element at a predetermined position where the key information recorded on the optical disc 2 can be read. Here, since the key information is only constant information for determining the decoding method, and the amount of the information is small, the geometric pattern and the bar code do not require definition. Therefore, the key information reading means 9 can be realized with a simple hardware configuration.
Further, if the key information is written in the area C of the optical disc 2, it is not necessary to use a special molding die for recording the key information when the optical disc 2 is manufactured, and the increase of the manufacturing process can be minimized. Therefore, the cost increase of the optical disc 2 can be minimized. Furthermore, since the key information is covered with the protective film, the probability that the key information cannot be read becomes very low.
【００１７】また、他の実施例としては、光ディスク２
の非データ記録領域４の例えばレーベル面に上記キー情
報を印刷により記録しても良い。この場合のキー情報に
おいても、上述のような幾何学模様やバーコード等で記
録すれば良い。In another embodiment, the optical disc 2
The key information may be recorded on the label surface of the non-data recording area 4 by printing. Also in this case, the key information may be recorded with the above-mentioned geometric pattern or barcode.
【００１８】[0018]
【発明の効果】以上説明したように本発明の光記録媒体
によれば、暗号化されたデジタル信号データがデータ記
録領域に記録された光記録媒体であって、前記デジタル
信号データを復号するための復号化方法を決定するキー
情報を前記光記録媒体上の前記データ記録領域以外の予
め定められた位置に記録したので、キー情報を提供する
ための媒体を用意する必要がなくなり、光記録媒体のコ
ストアップを最小限に抑えながら違法コピーを防止する
ための光記録媒体を提供することが可能になる。As described above, according to the optical recording medium of the present invention, it is an optical recording medium in which encrypted digital signal data is recorded in the data recording area, and is for decoding the digital signal data. Since the key information for determining the decoding method is recorded at a predetermined position other than the data recording area on the optical recording medium, it is not necessary to prepare a medium for providing the key information, and the optical recording medium It is possible to provide an optical recording medium for preventing illegal copying while minimizing the cost increase.
【００１９】また、本発明の再生装置によれば、暗号化
されたデジタル信号データをデータ記録領域に記録し、
前記デジタル信号データを復号するための復号化方法を
決定するキー情報を前記光記録媒体上の前記データ記録
領域以外の予め定められた位置に記録した光記録媒体を
再生する再生装置であって、前記光記録媒体のデータ記
録領域に記録されたデジタル信号データを読み取るため
のデータ読取手段と、前記光記録媒体上に記録されたキ
ー情報を読み取るためのキー情報読取り手段と、前記キ
ー情報読取手段により読み取られたキー情報により復号
化方法を決定し、この決定された復号化方法を用いて前
記データ読取り手段により読み出されたデジタル信号デ
ータを復号化する復号化手段とを備えので、違法コピー
により作成されたようなキー情報のない光記録媒体に付
いては再生不可能とすることができる等の効果がある。According to the reproducing apparatus of the present invention, the encrypted digital signal data is recorded in the data recording area,
A reproducing apparatus for reproducing an optical recording medium in which key information for determining a decoding method for decoding the digital signal data is recorded in a predetermined position other than the data recording area on the optical recording medium, Data reading means for reading digital signal data recorded in a data recording area of the optical recording medium, key information reading means for reading key information recorded on the optical recording medium, and the key information reading means And a decoding means for decoding the digital signal data read by the data reading means by using the determined decoding method. There is an effect such that the optical recording medium having no key information, such as that prepared by the above method, cannot be reproduced.
【図１】本発明の実施例の光ディスクの記録装置の概略
構成図である。FIG. 1 is a schematic configuration diagram of an optical disk recording apparatus according to an embodiment of the present invention.
【図２】本発明の実施例の光ディスクの再生装置の概略
構成図である。FIG. 2 is a schematic configuration diagram of an optical disk reproducing apparatus according to an embodiment of the present invention.
【図３】従来の光ディスクを示す図である。FIG. 3 is a diagram showing a conventional optical disc.
１ 記録装置 ２ 光ディスク（光記録媒体） ３ データ記録領域 ４ 非データ記録領域 ５ 暗号化手段 ６ 主データ記録手段 ７ キー情報記録手段 ８ 主データ読取り手段（データ読取り手段） ９ キー情報読取り手段 １０ 復号化手段 １１ 再生装置 1 recording device 2 optical disk (optical recording medium) 3 data recording area 4 non-data recording area 5 encryption means 6 main data recording means 7 key information recording means 8 main data reading means (data reading means) 9 key information reading means 10 decryption Device 11 Reproducing device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｎ 7/16 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication H04N 7/16 Z
Claims (2)
記録領域に記録された光記録媒体であって、 前記デジタル信号データを復号するための復号化方法を
決定するキー情報を前記光記録媒体上の前記データ記録
領域以外の予め定められた位置に記録したことを特徴と
する光記録媒体。1. An optical recording medium in which encrypted digital signal data is recorded in a data recording area, wherein key information for determining a decoding method for decoding the digital signal data is provided on the optical recording medium. The optical recording medium, wherein the data is recorded in a predetermined position other than the data recording area.
記録領域に記録し、前記デジタル信号データを復号する
ための復号化方法を決定するキー情報を前記光記録媒体
上の前記データ記録領域以外の予め定められた位置に記
録した光記録媒体を再生する再生装置であって、 前記光記録媒体のデータ記録領域に記録されたデジタル
信号データを読み取るためのデータ読取手段と、 前記光記録媒体上に記録されたキー情報を読み取るため
のキー情報読取り手段と、 前記キー情報読取手段により読み取られたキー情報によ
り復号化方法を決定し、この決定された復号化方法を用
いて前記データ読取り手段により読み出されたデジタル
信号データを復号化する復号化手段とを備えことを特徴
とする再生装置。2. The encrypted digital signal data is recorded in a data recording area, and key information for determining a decoding method for decoding the digital signal data is stored in a data recording area other than the data recording area on the optical recording medium. A reproducing device for reproducing an optical recording medium recorded at a predetermined position, comprising a data reading unit for reading digital signal data recorded in a data recording area of the optical recording medium, and an optical recording medium on the optical recording medium. Key information reading means for reading the recorded key information, and a decoding method is determined by the key information read by the key information reading means, and read by the data reading means using the determined decoding method. And a decoding means for decoding the outputted digital signal data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5177537A JPH0785574A (en) | 1993-06-25 | 1993-06-25 | Optical recording medium and reproducing device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5177537A JPH0785574A (en) | 1993-06-25 | 1993-06-25 | Optical recording medium and reproducing device therefor |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002219457A Division JP2003115164A (en) | 2002-07-29 | 2002-07-29 | Optical recording medium recorder |
| JP2002219459A Division JP2003115165A (en) | 2002-07-29 | 2002-07-29 | Method for recording optical recording medium |
| JP2002219458A Division JP2003109304A (en) | 2002-07-29 | 2002-07-29 | Method for playing back optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0785574A true JPH0785574A (en) | 1995-03-31 |
Family
ID=16032678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5177537A Pending JPH0785574A (en) | 1993-06-25 | 1993-06-25 | Optical recording medium and reproducing device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0785574A (en) |
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