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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
Grant status
Application
Patent type
Prior art keywords
data
carrier
duplication
prevention
published
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Withdrawn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
Original Assignee
Igor Groza
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

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00Record 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
    • G11B23/28Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281Indicating 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
    • G11B23/282Limited play
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746Circuits 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00Record 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
    • G11B23/30Record 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
    • G11B23/36Signals on record carriers or on containers and recorded by the same method as the main recording
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28Indexing; 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/007Arrangement 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14Heads, 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRICAL DIGITAL DATA PROCESSING
    • G06F2211/00Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/007Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537Optical discs
    • G11B2220/2587Laser 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 concerns a disk for recording digita Lischer information and a method for the laser guide for recording on the disc by 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. The justification of this invention, a management method is known, wherein a scanning laser with one or three laser beams is guided along a guide groove on a disk.

Als Nachteil eines solchen Führungsverfahren ist die Ungenauigkeit des Datenlasers mit den ihr verbundenen Abtastfehlern bekannt. The disadvantage of such an implementation procedures, the inaccuracy of the data laser with its associated sampling errors is known.

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

  • - zuerst eine Platte zu schaffen, bei der man am Anfang des Laser prozesses schon fest vorprogrammieren kann, welches Datenstück das Lasergerät abspielen soll. - First to create a board in which you can pre-program already established at the beginning of the laser process which piece of data is to play the laser device.
  • - zweitens eine Platte zu schaffen, bei der die Doublizierung und die Überspielmöglichkeit völlig ausgeschlossen ist. - secondly, to create a board in which the Doublizierung and the dubbing possibility is totally excluded.
  • - drittens ein Verfahren für eine Laserführung vorzustellen, mit Hilfe zweier Laserstrahlen. - thirdly to provide a method for a laser guide, by means of two laser beams.

Aufgrund dieser Aufgabe wird auch eine Maschine vorgeschlagen, die für die Herstellung der Musterplatte benutzt werden kann. Due to this problem, a machine is proposed, which 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. The object is achieved in that an additional body is 6 or 7 provided on the data disk. 3 Die Stelle, die da für benutzt wird, um eine zusätzliche Information aufzuzeichnen, die der Funktion des Abspielgerätes entspricht. The body, which is for use as, for recording 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. Other objects are achieved in that the laser instrument by means of two laser beams 22 + 23 along a contrast of the guide groove is guided 15th Und diese Führung wird mittels einer mechanischen bzw. anderer Kupplungen auf ein oder mehrere Aufzeichnungsinstrumente übertragen. And this guide is transferred by means of a mechanical or other couplings on one or more recording instruments.

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 advantages achievable with this invention are, in particular, that an important and costly information that is stored on a disk can be protected from fältigung Doublizierung and Verviel.

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 Führungsme is much simpler and cheaper mechanism of this recording machine systems than with the complicated mechanical guide.

Für die Beschreibung darliegender Erfindung sind folgende Zeich nungen dargestellt: the following undersigned calculations are presented for the description darliegender invention:

Es zeigt It shows

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

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

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 see a guide groove 14, 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 unge ferry 20% greater than the width of the guide groove.

Laserstrahl 19 wird in dem Fall auf ein minimum von Energie in stalliert. Laser beam 19 is stalled in the case of a minimum of energy in.

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 laser instruments 22 and 23 on the guide plate.

In Fig. 7 wird eine fehlerhafte Führung gezeigt, so daß der Laser strahl 22 auf die Führungsrille 15 angegriffen wird. In Fig. 7, a erroneous guide is shown, so that the laser beam is attacked 22 to the guide groove 15. 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 the Grei evaporation of the laser beam 22 of the other laser beam 23 is still without Greifung and therefore without a signal, so that in such combinations correct the correction systems of the player itself in the direction of "L".

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. In FIG. 8, another read error is shown, where the laser beam 23 engages the groove 15 and laser beam 22 is not yet arrived at the dark place. Daher versteht das Korrektursystem diese Kombination der Signale als Kommando zur Korrektur in Richtung "R". Therefore, the correction system understands this combination of 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. In Fig. 9 is a schematic representation with 3 independent in is formation layers 29, 32 and 35, which store the information on separate layers. Die Information der Schichten 29 , 32 und 35 kann man nur mit bestimmten, für jede Schicht eigene Laserstrahlfrequenzen abtasten. The information of the layers 29, 32 and 35 can scan only with certain, own for each layer, the laser beam frequencies.

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. 1. Data storage disk for storage and storage digitalischer and / or analogical information and / or data, characterized in that at least one additional point on at least one side of the plate (6) or (7) is provided, which for storage, storage, and playback an additional Multi-lingual and / or analogi specific information and / or data is provided. Daten, die zu dem Zweck benutzt werden: Data used for the purpose of:
  • - 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 og lnformationsstücke auf der Datendisk zu finden; - mationsstücken a series of numbers and sequences of independent Infor and store music tracks, image pieces, or other information and then to provide the player to find the above lnformationsstücke on the data disk;
  • - zum Aufzeichnen, wieviel mal diese Platte abgespielt war; - for recording how many times this disc was played;
  • - 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. - for storing the information that will later be compared with other infor mation, coming from a player and which corresponds to that just repeated to lock which encoded functions of this apparatus, 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 process for laser guidance, characterized in that said laser means 2 laser beams (22 + 23) along a spiral groove (15) is guided so that the distance between the two laser beams (22 + 23) exactly a width of the groove (15 ) corresponds to where the helical 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 said disk plate corresponds to the dimensions of the patterns, and retains a transparent or non-transparent or a reflective or non-reflec Rende surface (15) formed on in a spiral order the surface of the plate is registered, so that the shape of this area corresponds to (15) the order of the data which is subsequently to be carried on the sample plate or to the recording of the plate.
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 digitalischer infor mation on a pattern plate, are pressed out of their later other information carrier or be prepared take other Ver, characterized in that the recording laser under process of claim 2 along the stencil plate according to claim 3 is performed and the BEWE supply of the scanning laser is transmitted by mechanical, electronic or other coupling to one or more recording laser.
DE19883803982 1988-02-10 1988-02-10 Data carrier with duplication prevention Withdrawn DE3803982A1 (en)

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

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

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DE3803982A1 true true DE3803982A1 (en) 1990-01-25

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Cited By (15)

* 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
US5822291A (en) * 1995-03-23 1998-10-13 Zoom Television, Inc. Mass storage element and drive unit therefor
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
EP0511875A2 (en) * 1991-04-30 1992-11-04 Sharp Kabushiki Kaisha Information recording and reproducing apparatus
EP0511875A3 (en) * 1991-04-30 1994-05-11 Sharp Kk 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
EP0736212A4 (en) * 1993-12-22 1996-12-27 Randall Jamail Method of masking data on a storage medium
EP0736212A1 (en) * 1993-12-22 1996-10-09 Randall Jamail Method of masking data on a storage medium
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
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
US8543842B2 (en) 1995-02-13 2013-09-24 Intertrust Technologies Corporation System and methods for secure transaction management and electronics rights protection
US6427140B1 (en) 1995-02-13 2002-07-30 Intertrust Technologies Corp. Systems and methods for secure transaction management and electronic rights protection
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
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
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
WO1996029639A3 (en) * 1995-03-23 1997-02-20 Zoom Television Inc Interactive transaction management multimedia system
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
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
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
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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