Nds Corporation

Softricity, Inc.

Yishai Sered

Yossef Tsuria

Avi Wachtfogel

Yaron Sella

Shabtai Atlow

Moshe Kranc

Mark W Eichin

Jonathan Maissel

David Zviel

Gershon Bar-On

Amir Eilat

Nigel Stephen Dallard

Gene Itkis

Joe D Croman

Christopher N Anderson

Robert Rees

Seth Silverman

A method for determining that all of a scrambled message has been successfully received, the scrambled message being scrambled in accordance with a scrambling key and being capable of being descrambled in accordance with a descrambling key, descrambling key generating information for generating the descrambling key being included within a control message (ECM) associated with the scrambled message. The method includes providing a scrambled message scrambled in accordance with a scrambling key, generating an unmodified ECM including descrambling key generating information for generating a descrambling key for descrambling the scrambled message, generating a first derived value based on the scrambled message using a first value derivation function, applying a first modification function to the unmodified ECM, the first modification function being based, at least in part, on the first derived value, thereby producing a modified ECM, transmitting the scrambled message and the modified ECM to a receiver, and performing, at the receiver, the following steps: generating a second derived value based on the received scrambled message using a second value derivation function, applying a second modification function to the modified ECM, the second modification function being based, at least in part, on the second derived value and being an inverse of the first modification function, thereby producing the unmodified ECM, and employing the unmodified ECM to determine that all of the message has been successfully received. Related apparatus and methods are also provided.

System for determining successful reception of a message

Systems and methods for, inter alia, allowing a remote user to access content, such as data or an executable program, on demand from a remoter server. When accessed the content can be delivered on demand to the user's remote workstation for use by the user. As network resources may vary, the systems described herein further include systems that will monitor network resources, and other factors, versus the transfer demands for the content requested by the user. The systems may then determine a schedule, or load map, for transferring blocks of the content in a way that efficiently employs the available resources, and in a way that provides the user with a user-experience that is similar, or substantially similar, to the user-experience that the user would have if the content were stored locally on the user's workstation.

Systems and methods for delivering content over a computer network

A subscriber unit for use in a television system including a television network and transmitting apparatus for transmitting program schedule information, the subscriber unit including a receiving unit for receiving the program schedule information, a profile storage unit for storing at least one viewer preference profile of at least one television viewer, an intelligent agent for customizing the program schedule information based, at least in part, on the viewer preference profile, to produce a program guide including customized program schedule information, and display apparatus for displaying the program guide.

Intelligent electronic program guide

A key delivery method for use in an encoded communications system in which at least one encoded item including a first item encoded with a first item control word is sent in a communication stream from a sender to a receiver, the method including transmitting an item entitlement control message (IECM) including item control information, transmitting a stream entitlement control message (SECM) including stream control information, and combining at least part of the item control information and at least part of the stream control information to produce the first item control word. Related methods and apparatus are also disclosed.

Key delivery in a secure broadcasting system

This invention discloses a symbol-display subscriber unit for use with a broadcast system, the broadcast system including a headend and a network operative to transmit a composite signal from the headend to a multiplicity of subscriber units, the composite sigincluding an encoded broadcast signal encoded in accordance with a plurality of control words (CWs) and a plurality of encryption control messages (ECMs), each of the plurality of ECMs being associated respectively with one of the plurality of CWs and including CW generating information, the multiplicity of subscriber units including at least one said symbol-display subscriber unit, said symbol-display subscriber unit including: a receiver receiving the composite signal from the network, security apparatus in operative engagement with the receiver, the security apparatus receiving each of the plurality of ECMs from the receiver and generating the associated CW from the CW generating information comprised within each said ECM. and a decoder for decoding the encoded broadcast signal for display on a display device, the decoder receiving the encoded broadcast signal from the receiver and receiving the CW from the security apparatus, wherein the security apparatus supplies symbol display information to the decoder, and the decoder provides a symbol to the display device for display thereon, the symbol being based, at least in part, on the symbol display information. A method for producing a symbol is also disclosed.

Symbol-display system

This invention discloses an anti-piracy system including video representation signature apparatus for computing a forbidden signature of a forbidden video representation, communication apparatus for communicating the forbidden signature to a playing device, and a playing device adapted to receive and play back a recorded video representation, the playing device including reception apparatus for receiving the forbidden signature communicated by the communication apparatus, recorded video representation signature apparatus for computing a signature of the recorded video representation, and playback control apparatus operative to prevent playback of the recorded video representation if the computed signature of the recorded video representation matches the forbidden signature communicated to the playing device

System for preventing playback of unauthorized digital video recordings

Growing community of inventors

Jerusalem, Israel

Yishai Sered