CLV carrier copy protection system

Details CLV carrier copy protection system CLV carrier copy protection system

1998-10-20

2001-07-03

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S152000, C713S152000

Reexamination Certificate

active

06256738

ABSTRACT:

FIELD OF THE INVENTION
The present invention is in the general field of protecting CD-ROM and the like from piracy copying and unauthorized use.
BACKGROUND OF THE INVENTION
Until recently, removable storage media were predominantly magnetic diskettes such as 5¼ or 3½ inch removable diskette. In order to control unauthorized copying of software, various software based solutions such as specially formatted diskettes, or hardware based solutions such as dongles have been in use. These solutions, generally, barred the possibility of copying an original licensed user application program (stored in the form of one or more files) to different, unauthorized, sites in which they are used freely without the owner's consent. The proposed solutions posed some difficulties in terms of assuring that the protected modules that are incorporated into the user application do not interfere with the normal operation of the protected application, and therefore a significant portion of the computer industry did not adopt them as a standard solution and preferred to rely on legal different approaches such as copyright enforcement. In the past few years the removable medium which serves for storage of user application programs has migrated to CD-ROM which not only is characterized by a larger storage volume as compared to the ancestor magnetic storage medium, but provides an inherent copy protection feature. Thus, a magnetic storage medium such as a diskette can be easily copied by using a conventional operating system utility (e.g. “diskcopy” in the DOS operating system). Conversely, in order to copy a CD-ROM, special equipment is required which, until recently, carried a very high price tag, thus hindering the possibility of circulated copying of the original CD-ROMs. Software developers coudl therefore rely on the fact that in order to exploit their software, an original CD-ROM must be purchased and the likelihood of copying the original CD-ROM is negligible. This situation has recently been changed with the introduction of relatively cheaper CD-ROM copying devices which now facilitate unauthorized copying of CD-ROMs, thereby causing significant financial damages to the software developers. The recent advent of so called DVD (standing for Digital Video Disk) has further aggravated the problem since the latter enables not only to read data but also to write data thereon. Thus, by utilizing conventional DVD driver, files from an original CD-ROM may be copied to a blank DVD carrier and used without the consent of the software developer.
Accordingly, there arises a need in the art to incorporate in an original CLV carrier, means which will hinder the possibility of illegally copying and using part or all of the data stored in the original CLV carriers. CLV carrier, as is well known in the art, stands for Constant Linear Velocity which is the underlying technology shared by CD-ROM carrier, DVD carrier and others.
SUMMARY OF THE INVENTION
The invention provides for:
In a manufacturing process of a continuous linear velocity (CLV) storage medium, a method for rendering at least one file stored on said CLV storage medium immunized against an unauthorized duplication; the CLV includes a plurality of consecutive blocks, each including a data section and control section; the control section includes at least one error correction, and at least one error detection code; said blocks are configured in a given format;
the method comprising the steps of:
a. modifying at least a portion of the date section in at least one of said blocks so as to constitute modified data section; said modified data constitutes reconfigured format which violates said given format;
b. modifying the control section associated with said modified data section, such that at least said error correction or said error detection codes substantially match said modified data section.
The invention further provides for a continuous linear velocity (CLV) storage medium having at least one filed stored on said CLV storage medium; the CLV being immunized against an unauthorized duplication; the CLV includes a plurality of consecutive blocks, each including a data section and control section; the control section includes at least one error correction, and at least one error detection code; said blocks are configured in a given format; at least one of said blocks includes modified data in the data section constituting modified data section ; said modified data constituting reconfigured format which violate said given format; the control section associated with said modified data section is modified such that at least said error correction or said error detection codes substantially match said modified data section.
Still further, the invention provides for a real-time error handling procedures associated with a continuous linear velocity (CLV) storage medium having at least one file stored therein; the CLV includes a plurality of consecutive blocks, each including a data section and control section; the control section includes at least one error correction, and at least one error detection code; said blocks are configured in a given format;
the real-time error handling procedure is adapted to executed the following steps, that include:
a) detecting modified data in the data section of at least one block; said modified data constituting reconfigured format which violate said given format;
b) checking that the control section associated with said modified data section is modified such that at least said error correction or said error detection codes substantially match said modified data;
c) in the case that at least the conditions of said steps (a) and (b) are met, classifying said CLV as an original CLV, and otherwise classifying said CLV as an unauthorized duplication.
The invention further provides for a continuous linear velocity (CLV) storage medium having at least one file stored on said CLV storage medium; the CLV being an unauthorized substantially duplication of an original CLV; the CLV includes a plurality of consecutive blocks, each including a data section and control section; the data section of said blocks including a data constituting a file; said file is rendered inoperable since at least a portion thereof accommodated in said original CLV is absent in said unauthorized duplication of said CLV.


REFERENCES:
“Compact Disc Digital Audio System.” CEI IEC 908 (1987).
“CD-ROM and its Technology.” No. 36, pp. 559-660.
“Information Technology—Data Interchange on Read-Only 120 mm Optical Data Disks (CD-ROM).” International Standard, ISO/IEC 10149, Second Edition, (1995).

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