Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels

Abstract

Electronic steganographic techniques can be used to encode a rights management control signal onto an information signal carried over an insecure communications channel. Steganographic techniques ensure that the digital control information is substantially invisibly and substantially indelibly carried by the information signal. These techniques can provide end-to-end rights management protection of an information signal irrespective of transformations between analog and digital. An electronic appliance can recover the control information and use it for electronic rights management to provide compatibility with a Virtual Distribution Environment. In one example, the system encodes low data rate pointers within high bandwidth time periods of the content signal to improve overall control information read / seek times.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a continuation of application Ser. No. 10 / 618,427, filed Jul. 10, 2003, which is a continuation of application Ser. No. 10 / 189,231, filed Jul. 5, 2002, now U.S. Pat. No. 6,618,484, which is a continuation of application Ser. No. 09 / 790,566, filed Feb. 23, 2001, now U.S. Pat. No. 6,449,367, which is a continuation of application Ser. No. 09 / 247,328, filed Feb. 10, 1999, now U.S. Pat. No. 6,240,185, which is a continuation of application Ser. No. 08 / 689,606, filed Aug. 12, 1996, now U.S. Pat. No. 5,943,422, all of which are incorporated herein by reference and to which the benefit of priority is claimed.[0002]This application is related to commonly assigned copending application Ser. No. 08 / 388,107 of Ginter et al., filed 13 Feb. 1995, entitled “SYSTEMS AND METHODS FOR SECURE TRANSACTION MANAGEMENT AND ELECTRONIC RIGHTS PROTECTION,” (now abandoned). We incorporate by reference, into this application, the entire disclosure of this pri...

AI Technical Summary

Benefits of technology

[0004]The world is becoming digital. Digital signals are everywhere—in our computers, television sets, VCRs, home stereos, and CD players. Digital processing—which operates on information “bits” (numerical “on” or “off” values)—provides a degree of precision and protection from noise that cannot be matched by the older, “analog” formats we have used since the beginning of the electronic age.

Problems solved by technology

It will cost a great deal to convert local cable distribution from analog to digital.

Despite the pervasiveness of analog signals, existing methods for managing rights and protecting copyright in the analog realm are primitive or non-existent.

These methods can generally be easily circumvented.Not all existing devices respond appropriately to copy protection signals.Existing schemes are limited for example to “copy / no copy” controls.Copy protection for sound recordings has not been commercially implemented.

A related problem relates to the conversion of information between the analog and digital domains.

Even if information is effectively protected and controlled initially using strong digital rights management techniques, an analog copy of the same information may no longer be securely protected.

Unfortunately, sending digital information using such known digital encoding techniques is problematic because the digital information is not persistent.

Attempting to use insecure techniques for providing rights management is at best ineffective, and can be worse than no rights management at all.

More nefariously, an unscrupulous person could alter an insecure system by substituting false control information in place of the proper information.

Such substitutions could, for example, divert payments to someone other than legitimate rights holders—facilitating electronic fraud and theft.

Prior, insecure techniques fail to solve the overall problem of how to provide and securely manage advanced automatic electronic rights management for analog and other information signals conveyed over an insecure communications channel.

The lack of strong rights management for analog signals creates a huge gap in any comprehensive electronic rights management strategy, and makes it possible for consumers and others to circumvent—to at least some extent—even the strongest digital rights management technologies.

Anyone intercepting the paper will be unable to detect the secret message—or even know that it is there—unless the interceptor knows to look for the invisible message and also knows how to treat the paper to make the invisible ink visible

It may be difficult to detect (even with educated signal processing techniques) that the analog signal has been steganographically encoded with a rights management control signal, and it may be difficult to eliminate the steganographically encoded control signal without destroying or degrading the other information or content the signal carries.

Spectral transforms may be used to apply and recover such steganographically-encoded high frequency “noise.” Since the high frequency noise components of the information signal may be essentially random, adding a pseudo-random steganographically encoded control signal component may introduce substantially no discernible information signal degradation, and may be difficult to strip out once introduced (at least without additional knowledge of how the signal was incorporated, which may include a shared secret).

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