DE3803982A1 - Data carrier with duplication prevention - Google Patents

Data carrier with duplication prevention

Info

Publication number
DE3803982A1
DE3803982A1 DE19883803982 DE3803982A DE3803982A1 DE 3803982 A1 DE3803982 A1 DE 3803982A1 DE 19883803982 DE19883803982 DE 19883803982 DE 3803982 A DE3803982 A DE 3803982A DE 3803982 A1 DE3803982 A1 DE 3803982A1
Authority
DE
Germany
Prior art keywords
information
laser
data
recording
disk
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.)
Withdrawn
Application number
DE19883803982
Other languages
German (de)
Inventor
Igor Groza
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19883803982 priority Critical patent/DE3803982A1/en
Publication of DE3803982A1 publication Critical patent/DE3803982A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
    • G11B23/282—Limited play
    • 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
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • G11B23/36—Signals on record carriers or on containers and recorded by the same method as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • 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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2587—Laser Discs; Optical disc using analog recording

Abstract

Published without abstract.

Description

Die Erfindung betrifft eine Platte für die Aufzeichnung digita­ lischer Informationen sowie ein Verfahren für die Laserführung bei Aufzeichnung auf die Platte mittels eines Lasers.The invention relates to a plate for recording digita information and a procedure for laser guidance when recording on the disc by means of a laser.

Als Begründung dieser Erfindung ist ein Führungsverfahren bekannt, wobei ein Abtastlaser mit ein oder drei Laserstrahlen entlang einer Führungsrille auf einen Datenträger geführt wird.A guidance method is known as the justification for this invention, a scanning laser with one or three laser beams along one Guide groove is performed on a disk.

Als Nachteil eines solchen Führungsverfahren ist die Ungenauigkeit des Datenlasers mit den ihr verbundenen Abtastfehlern bekannt.The disadvantage of such a management procedure is the imprecision of the data laser with the associated scanning errors known.

Der Erfindung liegt die Aufgabe zugrunde:The invention is based on the object:

  • - zuerst eine Platte zu schaffen, bei der man am Anfang des Laser­ prozesses schon fest vorprogrammieren kann, welches Datenstück das Lasergerät abspielen soll.- First create a plate where you start at the laser process can already pre-program which piece of data that Laser device should play.
  • - zweitens eine Platte zu schaffen, bei der die Doublizierung und die Überspielmöglichkeit völlig ausgeschlossen ist.- second, to create a plate in which the duplication and the possibility of dubbing is completely excluded.
  • - drittens ein Verfahren für eine Laserführung vorzustellen, mit Hilfe zweier Laserstrahlen.- third, to present a method for laser guidance with Using two laser beams.

Aufgrund dieser Aufgabe wird auch eine Maschine vorgeschlagen, die für die Herstellung der Musterplatte benutzt werden kann.Because of this task, a machine is also proposed can be used for the production of the sample plate.

Die Aufgabe wird dadurch gelöst, daß auf die Datenplatte 3 eine zusätzliche Stelle 6 bzw. 7 vorgesehen wird. Die Stelle, die da­ für benutzt wird, um eine zusätzliche Information aufzuzeichnen, die der Funktion des Abspielgerätes entspricht. The object is achieved in that an additional location 6 or 7 is provided on the data plate 3 . The location that is used to record additional information that corresponds to the function of the player.

Weitere Aufgaben werden dadurch gelöst, daß das Laserinstrument mit Hilfe zweier Laserstrahlen 22 + 23 entlang eines Kontrastes die Führungsrille 15 geführt wird. Und diese Führung wird mittels einer mechanischen bzw. anderer Kupplungen auf ein oder mehrere Aufzeichnungsinstrumente übertragen.Further objects are achieved in that the laser instrument is guided along a contrast with the guide groove 15 with the aid of two laser beams 22 + 23 . And this guidance is transferred to one or more recording instruments by means of a mechanical or other coupling.

Die erzielbaren Vorteile dieser Erfindung liegen insbesondere darin, daß eine wichtige und kostspielige Information, die auf einen Datenträger gespeichert ist, gegen Doublizierung und Verviel­ fältigung geschützt werden kann.The achievable advantages of this invention are in particular in that important and costly information that is on a data carrier is stored, against duplication and duplication can be protected.

Weitere Vorteile liegen insbesondere darin, daß der Führungsme­ chanismus dieser Aufzeichnungsmaschine deutlich einfacher und billiger wird, als bei den komplizierten, mechanischen Führungs­ systemen.Further advantages are in particular that the leadership mechanism of this recording machine is significantly simpler and becomes cheaper than the complicated mechanical guide systems.

Für die Beschreibung darliegender Erfindung sind folgende Zeich­ nungen dargestellt:The following signs are used to describe the present invention shown:

Es zeigtIt shows

Fig. 1 zeigt einen Datenträger 3 mit zusätzlicher Informations­ stelle 6 bzw. 7. Stelle 6 oder 7 können in einen beliebigen Kreis oder andere Formen vorgesehen werden. Fig. 1 shows a data carrier 3 with additional information point 6 and 7th Position 6 or 7 can be provided in any circle or other shapes.

Fig. 3 zeigt einen Datenträger 3, der in diesem Fall als Führungs­ schablone gefertigt ist. In diesem Datenträger ist ein Schnitt 13 zur Erklärung des Prinzips der Laserführung gezeichnet. Fig. 3 shows a data carrier 3 , which is made in this case as a guide template. A section 13 for explaining the principle of laser guidance is drawn in this data carrier.

Auf Fig. 4 ist der Schnitt 13 vergrößert, so daß man deutlich eine Führungsrille 14, 15 und 16 sehen kann, die auf einem negativen Feld 17, 18 aufgebracht ist.In FIG. 4, the section 13 is enlarged, so that one can clearly a guide groove 14, see 15 and 16, which is applied to a negative field 17, 18.

Der Abstand zwischen den Führungsrillen 14, 15 und 16 ist unge­ fähr 20% größer als die Breite der Führungsrille.The distance between the guide grooves 14 , 15 and 16 is approximately 20% larger than the width of the guide groove.

Laserstrahl 19 wird in dem Fall auf ein minimum von Energie in­ stalliert.In this case, laser beam 19 is installed at a minimum of energy.

Auf Fig. 5 ist das Führungsprinzip mit 3 Laserstrahlen 19, 20 und 21 dargestellt. In Fig. 5 the guide principle with 3 laser beams 19, 20 and 21 is shown.

Fig. 6 zeigt die Installation des zweistrahligen 22 und 23 Laser­ instrumente auf der Führungsplatte. Fig. 6 shows the installation of the two-beam 22 and 23 laser instruments on the guide plate.

In Fig. 7 wird eine fehlerhafte Führung gezeigt, so daß der Laser­ strahl 22 auf die Führungsrille 15 angegriffen wird. Bei der Grei­ fung des Laserstrahls 22 ist der andere Laserstrahl 23 noch ohne Greifung und darum ohne ein Signal, so daß bei solchen Kombinationen die Korrektursysteme des Abspielgerätes selbst in Richtung "L" korrigieren.In Fig. 7 a faulty guidance is shown so that the laser beam 22 is attacked on the guide groove 15 . In the Grei tion of the laser beam 22 , the other laser beam 23 is still without gripping and therefore without a signal, so that in such combinations, the correction systems of the player itself correct in the "L" direction.

In Fig. 8 wird ein anderer Lesefehler gezeigt, wo der Laserstrahl 23 die Rille 15 angreift und Laserstrahl 22 noch nicht an der dunklen Stelle angekommen ist. Daher versteht das Korrektursystem diese Kombination der Signale als Kommando zur Korrektur in Richtung "R".Another reading error is shown in FIG. 8, where the laser beam 23 attacks the groove 15 and the laser beam 22 has not yet reached the dark place. The correction system therefore understands this combination of the signals as a command for correction in the direction "R".

In Fig. 9 ist eine schematische Darstellung mit 3 unabhängigen In­ formationsschichten 29, 32 und 35, welche die Informationen auf selbständige Schichten speichern. Die Information der Schichten 29, 32 und 35 kann man nur mit bestimmten, für jede Schicht eigene Laserstrahlfrequenzen abtasten.In Fig. 9 is a schematic representation with 3 independent information layers 29 , 32 and 35 , which store the information on independent layers. The information of the layers 29 , 32 and 35 can only be scanned with certain laser beam frequencies which are separate for each layer.

Claims (4)

1. Datenspeicherplatte für Speicherung und Lagerung digitalischer oder/und analogischer Informationen oder/und Daten, dadurch gekennzeichnet, daß auf mindestens einer Seite der Platte mindestens eine zusätzliche Stelle (6) oder (7) vorgesehen ist, welche für die Speicherung, Lagerung und Wiedergabe eine zusätzliche digitalische oder/und analogi­ sche Information oder/und Daten vorgesehen ist. Daten, die zu dem Zweck benutzt werden:
  • - eine Reihe von Nummern und Folgen von selbständigen Infor­ mationsstücken sowie Musiktiteln, Bildstücken oder andere Informationen zu speichern und danach dem Abspielgerät zu liefern, um die o. g. lnformationsstücke auf der Datendisk zu finden;
  • - zum Aufzeichnen, wieviel mal diese Platte abgespielt war;
  • - zur Lagerung der Information, die später mit anderen Infor­ mationen verglichen wird, die aus einem Abspielgerät kommen und die dem entspricht, welche kodierte Funktionen dieses Gerät gerade wiederholt, um einige Funktionen dem Gerät zu sperren.
1. Data storage disk for storage and storage of digital and / or analog information and / or data, characterized in that at least one additional location ( 6 ) or ( 7 ) is provided on at least one side of the disk, which for storage, storage and playback additional digital and / or analog information and / or data is provided. Data used for the purpose:
  • - to store a number of numbers and sequences of independent pieces of information as well as music tracks, picture pieces or other information and then to deliver them to the playback device in order to find the above-mentioned pieces of information on the data disc;
  • - to record how many times this disc has been played;
  • - To store the information that will be compared later with other information, coming from a player and which corresponds to which coded functions this device is currently repeating to block some functions of the device.
2. Verfahren zur Laserführung, dadurch gekennzeichnet, daß der Laser mittels 2 Laserstrahlen (22 + 23) entlang einer spiral­ förmigen Rille (15) geführt wird, so daß der Abstand zwischen beiden Laserstrahlen (22 + 23) genau eine Breite der Rille (15) entspricht, wo die spiralförmige Rille (15) eine transparente oder nicht-transparente Fläche bzw. eine reflektierende oder nicht-reflektierende Fläche auf der Führungsplatte (3) ist. 2. A method for laser guidance, characterized in that the laser is guided by means of 2 laser beams ( 22 + 23 ) along a spiral-shaped groove ( 15 ), so that the distance between the two laser beams ( 22 + 23 ) is exactly one width of the groove ( 15 ) corresponds to where the spiral groove ( 15 ) is a transparent or non-transparent surface or a reflective or non-reflective surface on the guide plate ( 3 ). 3. Führungsplatte, für das Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß diese Platte den Abmessungen der Muster­ platte entspricht, und behält eine transparente oder nicht­ transparente bzw. eine reflektierende oder nicht-reflektie­ rende Fläche (15), die in spiralförmiger Ordnung auf der Fläche der Platte eingetragen ist, so daß die Form dieser Fläche (15) der Ordnung der Daten entspricht, welche später auf der Musterplatte bzw. auf die Aufzeichnung der Platte auf­ getragen werden soll.3. guide plate, for the method according to claim 2, characterized in that this plate corresponds to the dimensions of the sample plate, and retains a transparent or non-transparent or a reflecting or non-reflecting surface ( 15 ) in a spiral order the area of the disk is entered so that the shape of this area ( 15 ) corresponds to the order of the data which is later to be carried on the sample disk or on the recording of the disk. 4. Aufzeichnungsmaschine für Aufzeichnung digitalischer Infor­ mationen auf eine Musterplatte, von deren später andere Informationsträger ausgepreßt werden bzw. mit anderen Ver­ fahren hergestellt werden, dadurch gekennzeichnet, daß der Aufnahmelaser unter Verfahren von Anspruch 2 entlang der Schablonenplatte nach Anspruch 3 geführt wird und die Bewe­ gung des Abtastlasers wird durch mechanische, elektronische bzw. anderer Kupplung auf ein oder mehrere Aufzeichnungslaser übertragen.4. Recording machine for recording digital information mations on a sample plate, of which others later Information carriers are squeezed out or with other ver drive are produced, characterized in that the Recording laser using the method of claim 2 along the Template plate is performed according to claim 3 and the Bewe The scanning laser is powered by mechanical, electronic or other coupling on one or more recording lasers transfer.
DE19883803982 1988-02-10 1988-02-10 Data carrier with duplication prevention Withdrawn DE3803982A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883803982 DE3803982A1 (en) 1988-02-10 1988-02-10 Data carrier with duplication prevention

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883803982 DE3803982A1 (en) 1988-02-10 1988-02-10 Data carrier with duplication prevention

Publications (1)

Publication Number Publication Date
DE3803982A1 true DE3803982A1 (en) 1990-01-25

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Family Applications (1)

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DE19883803982 Withdrawn DE3803982A1 (en) 1988-02-10 1988-02-10 Data carrier with duplication prevention

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511875A2 (en) * 1991-04-30 1992-11-04 Sharp Kabushiki Kaisha Information recording and reproducing apparatus
WO1996029639A2 (en) * 1995-03-23 1996-09-26 Zoom Television, Inc. Interactive transaction management multimedia system
EP0736212A1 (en) * 1993-12-22 1996-10-09 Randall Jamail Method of masking data on a storage medium
WO1997043761A2 (en) * 1996-05-15 1997-11-20 Intertrust Technologies Corp. Cryptographic methods, apparatus and systems for storage media electronic rights management in closed and connected appliances
EP1033711A2 (en) * 1993-10-29 2000-09-06 Time Warner Entertainment Co., L.P. Software carrier for play on a system for authenticating software carriers
US6138119A (en) 1997-02-25 2000-10-24 Intertrust Technologies Corp. Techniques for defining, using and manipulating rights management data structures
US6363488B1 (en) 1995-02-13 2002-03-26 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
US6449367B2 (en) 1996-08-12 2002-09-10 Intertrust Technologies Corp. Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
US6658568B1 (en) 1995-02-13 2003-12-02 Intertrust Technologies Corporation Trusted infrastructure support system, methods and techniques for secure electronic commerce transaction and rights management
US7844835B2 (en) 1995-02-13 2010-11-30 Intertrust Technologies Corporation Systems and methods for secure transaction management and electronic rights protection
US7925898B2 (en) 1996-08-12 2011-04-12 Intertrust Technologies Corp. Systems and methods using cryptography to protect secure computing environments
US8185473B2 (en) 1995-02-13 2012-05-22 Intertrust Technologies Corporation Trusted infrastructure support systems, methods and techniques for secure electronic commerce, electronic transactions, commerce process control and automation, distributed computing, and rights management
US8510226B2 (en) 1996-02-26 2013-08-13 Graphon Corporation Method for synchronous encryption between a client and a licensing agent
US8533851B2 (en) 1996-08-30 2013-09-10 Intertrust Technologies Corporation Systems and methods for secure transaction management and electronic rights protection

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511875A3 (en) * 1991-04-30 1994-05-11 Sharp Kk Information recording and reproducing apparatus
EP0511875A2 (en) * 1991-04-30 1992-11-04 Sharp Kabushiki Kaisha Information recording and reproducing apparatus
EP1033711A2 (en) * 1993-10-29 2000-09-06 Time Warner Entertainment Co., L.P. Software carrier for play on a system for authenticating software carriers
EP1033711A3 (en) * 1993-10-29 2002-04-03 Time Warner Entertainment Co., L.P. Software carrier for play on a system for authenticating software carriers
EP0736212A1 (en) * 1993-12-22 1996-10-09 Randall Jamail Method of masking data on a storage medium
EP0736212A4 (en) * 1993-12-22 1996-12-27 Randall Jamail Method of masking data on a storage medium
US7844835B2 (en) 1995-02-13 2010-11-30 Intertrust Technologies Corporation Systems and methods for secure transaction management and electronic rights protection
US6658568B1 (en) 1995-02-13 2003-12-02 Intertrust Technologies Corporation Trusted infrastructure support system, methods and techniques for secure electronic commerce transaction and rights management
US8751793B2 (en) 1995-02-13 2014-06-10 Intertrust Technologies Corp. Trusted infrastructure support systems, methods and techniques for secure electronic commerce transaction and rights management
US8543842B2 (en) 1995-02-13 2013-09-24 Intertrust Technologies Corporation System and methods for secure transaction management and electronics rights protection
US8185473B2 (en) 1995-02-13 2012-05-22 Intertrust Technologies Corporation Trusted infrastructure support systems, methods and techniques for secure electronic commerce, electronic transactions, commerce process control and automation, distributed computing, and rights management
US6363488B1 (en) 1995-02-13 2002-03-26 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
US7917749B2 (en) 1995-02-13 2011-03-29 Intertrust Technologies Corporation Systems and methods for secure transaction management and electronic rights protection
US6389402B1 (en) 1995-02-13 2002-05-14 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
US6427140B1 (en) 1995-02-13 2002-07-30 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
WO1996029639A3 (en) * 1995-03-23 1997-02-20 Zoom Television Inc Interactive transaction management multimedia system
WO1996029639A2 (en) * 1995-03-23 1996-09-26 Zoom Television, Inc. Interactive transaction management multimedia system
US5822291A (en) * 1995-03-23 1998-10-13 Zoom Television, Inc. Mass storage element and drive unit therefor
US8510226B2 (en) 1996-02-26 2013-08-13 Graphon Corporation Method for synchronous encryption between a client and a licensing agent
WO1997043761A3 (en) * 1996-05-15 1998-04-02 Intertrust Tech Corp Cryptographic methods, apparatus and systems for storage media electronic rights management in closed and connected appliances
WO1997043761A2 (en) * 1996-05-15 1997-11-20 Intertrust Technologies Corp. Cryptographic methods, apparatus and systems for storage media electronic rights management in closed and connected appliances
US6618484B2 (en) 1996-08-12 2003-09-09 Intertrust Technologies Corporation Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
US6449367B2 (en) 1996-08-12 2002-09-10 Intertrust Technologies Corp. Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
US7925898B2 (en) 1996-08-12 2011-04-12 Intertrust Technologies Corp. Systems and methods using cryptography to protect secure computing environments
US8307212B2 (en) 1996-08-12 2012-11-06 Intertrust Technologies Corp. Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
US8533851B2 (en) 1996-08-30 2013-09-10 Intertrust Technologies Corporation Systems and methods for secure transaction management and electronic rights protection
US6138119A (en) 1997-02-25 2000-10-24 Intertrust Technologies Corp. Techniques for defining, using and manipulating rights management data structures

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