GB2439012A - Novel trick mode system - Google Patents

Novel trick mode system

Info

Publication number
GB2439012A
GB2439012A GB0718798A GB0718798A GB2439012A GB 2439012 A GB2439012 A GB 2439012A GB 0718798 A GB0718798 A GB 0718798A GB 0718798 A GB0718798 A GB 0718798A GB 2439012 A GB2439012 A GB 2439012A
Authority
GB
United Kingdom
Prior art keywords
sending
key
video
seconds
frame
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.)
Granted
Application number
GB0718798A
Other versions
GB2439012B (en
GB0718798D0 (en
Inventor
Yair Mirsky
Reuven Wachtfogel
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.)
Synamedia Ltd
Original Assignee
NDS Ltd
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 NDS Ltd filed Critical NDS Ltd
Publication of GB0718798D0 publication Critical patent/GB0718798D0/en
Publication of GB2439012A publication Critical patent/GB2439012A/en
Application granted granted Critical
Publication of GB2439012B publication Critical patent/GB2439012B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
    • G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
    • G11B20/00507—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis
    • 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
    • G11B27/005—Reproducing at a different information rate from the information rate of recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/4147—PVR [Personal Video Recorder]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8453—Structuring of content, e.g. decomposing content into time segments by locking or enabling a set of features, e.g. optional functionalities in an executable program
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction

Abstract

A method is described for trick mode playback, the method including selecting a key-frame in a recording substantially in the vicinity of a trick mode playback starting position, preparing a decryption key associated with a key period including the selected key-frame, sending the prepared decryption key to a descrambler, thereby enabling decryption of video beginning at the selected key-frame, sending a first number P seconds of decrypted video frames, starting at the selected key-frame, at a predetermined speed for a predetermined number of seconds, to a video decoder, in parallel to the sending P seconds of video frames, choosing at least a second video section to stream to the video decoder, sending a decryption key associated with the chosen second video section to the descrambler, and repeating the steps of selecting, preparing, sending the prepared decryption key, and sending a first number P seconds of decrypted video frames. Related apparatus and methods are also described.
GB0718798A 2005-04-07 2006-01-18 Trick mode system for a personal video recorder Expired - Fee Related GB2439012B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66913405P 2005-04-07 2005-04-07
PCT/IL2006/000071 WO2006106498A2 (en) 2005-04-07 2006-01-18 Novel trick mode system

Publications (3)

Publication Number Publication Date
GB0718798D0 GB0718798D0 (en) 2007-11-07
GB2439012A true GB2439012A (en) 2007-12-12
GB2439012B GB2439012B (en) 2010-07-28

Family

ID=37073842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0718798A Expired - Fee Related GB2439012B (en) 2005-04-07 2006-01-18 Trick mode system for a personal video recorder

Country Status (3)

Country Link
US (1) US7995904B2 (en)
GB (1) GB2439012B (en)
WO (1) WO2006106498A2 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0516744A2 (en) 2004-06-07 2013-05-28 Sling Media Inc Media stream playback methods received on a network and computer program product
CN101022028B (en) 2007-01-12 2010-08-18 炬力集成电路设计有限公司 Quick forward or quick backward method for digital copyright management multimedia player
US8189689B2 (en) * 2008-08-12 2012-05-29 Himax Technologies Limited Receiver for reducing PCR jitter
US20100077435A1 (en) * 2008-09-24 2010-03-25 Concert Technology System and method for smart trick mode display
US8781305B2 (en) * 2008-12-02 2014-07-15 Microsoft Corporation Media streaming with smooth fast-forward and rewind
US9183881B2 (en) 2009-02-02 2015-11-10 Porto Technology, Llc System and method for semantic trick play
KR20100089228A (en) * 2009-02-03 2010-08-12 삼성전자주식회사 Method and apparatus for encrypting transport stream of multimedia content, method and apparatus for descrypting transport stream of multimedia content
US8532472B2 (en) * 2009-08-10 2013-09-10 Sling Media Pvt Ltd Methods and apparatus for fast seeking within a media stream buffer
US9749676B2 (en) * 2010-06-08 2017-08-29 Microsoft Technology Licensing, Llc Virtual playback speed modification
MX2016008146A (en) 2013-12-20 2016-09-14 Arthrocare Corp Knotless all suture tissue repair.
US10142707B2 (en) * 2016-02-25 2018-11-27 Cyberlink Corp. Systems and methods for video streaming based on conversion of a target key frame
CN108881917B (en) * 2018-07-27 2019-12-03 西安电子科技大学 Parallel decoding quicksort method based on high speed real-time decoding platform

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282249A (en) * 1989-11-14 1994-01-25 Michael Cohen System for controlling access to broadcast transmissions
US5377051A (en) * 1993-01-13 1994-12-27 Hitachi America, Ltd. Digital video recorder compatible receiver with trick play image enhancement
US6178242B1 (en) * 1997-02-07 2001-01-23 Nds Limited Digital recording protection system
IL125141A0 (en) 1998-06-29 1999-01-26 Nds Ltd Advanced television system
FR2799260B1 (en) 1999-10-04 2001-12-07 Acc La Jonchere ARTICULATED JOINT, IN PARTICULAR FOR CONNECTING BETWEEN TWO FLOW LINES OF LIQUID OR GASEOUS FLUID
CN1524362A (en) * 2001-07-06 2004-08-25 �ʼҷ����ֵ������޹�˾ Streamcipher information redundant in next packet of encrypted frame
GB0117926D0 (en) 2001-07-23 2001-09-12 Nds Ltd Method for random access to encrypted content
US7463737B2 (en) * 2001-08-15 2008-12-09 Digeo, Inc. System and method for conditional access key encryption
US6980650B2 (en) * 2003-10-27 2005-12-27 Nds Limited System for providing keys

Also Published As

Publication number Publication date
US20080212775A1 (en) 2008-09-04
WO2006106498A2 (en) 2006-10-12
US7995904B2 (en) 2011-08-09
GB2439012B (en) 2010-07-28
GB0718798D0 (en) 2007-11-07
WO2006106498A3 (en) 2007-11-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20230118