ClassID:

229740

H04N2005/91335 - CPC Classification

Classification description:

Details of television systems; Television signal recording; Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark

Recent Application in this class:
#1
20250029199
2025-01-23

EMBEDDING DATA IN VIDEO WITHOUT VISIBLE IMPAIRMENTS

#2
20240364851
2024-10-31

SECURE TRANSFER OF PREVIOUSLY BROADCASTED CONTENT

#3
20230336700
2023-10-19

Method and apparatus for secure transfer and playback of multimedia content

#4
20230027170
2023-01-26

Multimedia content protection

#5
20220044347
2022-02-10

Embedding data in video without visible impairments

#6
20220021858
2022-01-20

Method and apparatus for secure transfer and playback of multimedia content

#7
20210127085
2021-04-29

Video content authentication

#8
20210104258
2021-04-08

DIGITAL INFORMATION RECORDING APPARATUS, REPRODUCING APPARATUS AND TRANSMITTING APPARATUS

#9
20200314403
2020-10-01

Method and apparatus for displaying branded video tags

#10
20200128222
2020-04-23

Secure transfer of previously broadcasted content

#11
20200105300
2020-04-02

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

#12
20190295208
2019-09-26

Embedding data in video without visible impairments

#13
20190087926
2019-03-21

EMBEDDING DIGITAL CONTENT WITHIN A DIGITAL PHOTOGRAPH DURING CAPTURE OF THE DIGITAL PHOTOGRAPH

#14
20190075280
2019-03-07

Method and apparatus for secure transfer and playback of multimedia content

#15
20190069044
2019-02-28

Streaming piracy detection method and system

#16
20190026854
2019-01-24

Embedding digital content within a digital photograph during capture of the digital photograph

#17
20180332323
2018-11-15

Method for watermarking encrypted digital content, method and device for retrieving a unique identifier from watermarked content and content distribution network

#18
20180288362
2018-10-04

Integrity verification of an audio-visual data stream

#19
20180285537
2018-10-04

Difference attack protection

#20
20180270528
2018-09-20

Determining a quality measure for a processed video signal

#21
20180255269
2018-09-06

System, device, and method for evidentiary management of digital data associated with a localized Miranda-type process

#22
20180220177
2018-08-02

Method and apparatus for hardware-enforced, always-on insertion of a watermark in a video processing path

#23
20180205922
2018-07-19

Techniques to extract ENF signals from video image sequences exploiting the rolling shutter mechanism; and a new video synchronization approach by matching the ENF signals extracted from soundtracks and image sequences

#24
20180144754
2018-05-24

Video assisted digital audio watermarking

#25
20180070048
2018-03-08

MANAGEMENT OF MEDIA CONTENT ON A STORAGE MEDIUM

#26
20180068411
2018-03-08

Embedding digital content within a digital photograph during capture of the digital photograph

#27
20180025462
2018-01-25

Method and apparatus for publishing locational copyrighted watermarking video

#28
20180014089
2018-01-11

Streaming piracy detection method and system

#29
20170365292
2017-12-21

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

#30
20170235927
2017-08-17

Method and system for controlling media conveyance by a device to a user based on current location of the device

#31
20170154187
2017-06-01

DIGITAL COMMUNICATIONS

#32
20170048480
2017-02-16

System and method for fine-grained control of privacy from image and video recording devices

#33
20170046332
2017-02-16

MULTI-MEDIA COMMUNICATIONS RECORDING SYSTEM

#34
20170011485
2017-01-12

Embedding digital content within a digital photograph during capture of the digital photograph

#35
20160345079
2016-11-24

Video watermarking techniques

#36
20160344890
2016-11-24

Embedding data in halftone images

#37
20160277780
2016-09-22

Method and apparatus for hardware-enforced, always-on insertion of a watermark in a video processing path

#38
20160249095
2016-08-25

Method and apparatus for secure transfer and playback of multimedia content

#39
20160191988
2016-06-30

Secure transfer of previously broadcasted content

#40
20160117558
2016-04-28

Method and apparatus for securing computer video and audio subsystems

#41
20160094802
2016-03-31

RECEIVER-SIDE MARKING OF CONTENT FOR UNIQUE IDENTIFICATION

#42
20160093159
2016-03-31

Data storage and access systems

#43
20150379660
2015-12-31

System and method for embedding data

#44
20150340059
2015-11-26

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

#45
20150296170
2015-10-15

System and method for fine-grained control of privacy from image and video recording devices

#46
20150235336
2015-08-20

Embedding digital content within a digital photograph during capture of the digital photograph

#47
20150128290
2015-05-07

Digital communications

#48
20150049901
2015-02-19

Method and electronic device for controlling content integrity using numerical data

#49
20150043891
2015-02-12

Second screen device and system

#50
20140373164
2014-12-18

Associating first and second watermarks with audio or video content

#51
20140355817
2014-12-04

Pre-processed information embedding system

#52
20140286623
2014-09-25

Method for copy protection

#53
20140282735
2014-09-18

Second screen methods and arrangements

#54
20140248039
2014-09-04

Method and apparatus for securing computer video and audio subsystems

#55
20140237514
2014-08-21

Method and apparatus for secure transfer and playback of multimedia content

#56
20140019767
2014-01-16

Content segmentation of watermarking

#57
20130318550
2013-11-28

Adding watermarks to video content

#58
20130301872
2013-11-14

Hardware-enforced, always-on insertion of a watermark in a video processing path

#59
20130297941
2013-11-07

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#60
20130282534
2013-10-24

Data storage and access systems

#61
20130094837
2013-04-18

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

#62
20130046658
2013-02-21

Data storage and access systems

#63
20130011003
2013-01-10

Associating first and second watermarks with audio or video content

#64
20120315020
2012-12-13

Distributed digital video processing system

#65
20120311623
2012-12-06

METHODS AND SYSTEMS FOR OBTAINING STILL IMAGES CORRESPONDING TO VIDEO

#66
20120243727
2012-09-27

Device and method for embedding watermarks in contents and for detecting embedded watermarks

#67
20120203364
2012-08-09

METHOD AND APPARATUS FOR SECURE REMOTE REAL TIME COLLABORATIVE ACOUSTIC PERFORMANCE RECORDINGS

#68
20120158550
2012-06-21

MUSIC METHODS AND SYSTEMS

#69
20120155233
2012-06-21

Method for copy protection

#70
20120151216
2012-06-14

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#71
20120134498
2012-05-31

Reproducing apparatus, recording apparatus and display apparatus

#72
20120079514
2012-03-29

Method and apparatus for network content download and recording

#73
20110302054
2011-12-08

Data storage and access systems

#74
20110283102
2011-11-17

Method and system for supporting watermark embedding in multimedia system-on-chips

#75
20110261996
2011-10-27

Digital video protection for authenticity verification

#76
20110243375
2011-10-06

Inserting watermarks into portions of digital signals

#77
20110202963
2011-08-18

Method and apparatus for displaying branded video tags

#78
20110194730
2011-08-11

Control signals in streaming audio or video indicating a watermark

#79
20110188700
2011-08-04

Apparatus for inserting watermark and method therefor

#80
20110154504
2011-06-23

MANAGEMENT SERVER DEVICE, CONTENT REPRODUCTION DEVICE, AND RECORDING MEDIUM

#81
20110135271
2011-06-09

Method and apparatus for secure transfer and playback of multimedia content

#82
20110131604
2011-06-02

Method and apparatus for secure transfer and playback of multimedia content

#83
20110123065
2011-05-26

Apparatus and method for generating constructively multi-patterned watermark, and apparatus and method for inserting and detecting the watermark using the same

#84
20110114723
2011-05-19

Data storage and access systems

#85
20110106539
2011-05-05

Audio and video signal processing

#86
20110073643
2011-03-31

Data storage and access systems

#87
20110066525
2011-03-17

Data storage and access systems

#88
20110064227
2011-03-17

Reproducing apparatus, recording apparatus and display apparatus

#89
20110050990
2011-03-03

System and method for embedding data in video

#90
20110040975
2011-02-17

System and method for controlled copying and moving of content between devices and domains based on conditional encryption of content key depending on usage state

#91
20110040780
2011-02-17

Audio processing

#92
20110038594
2011-02-17

Handheld recorder incorporating true raw audio or video certification

#93
20100318664
2010-12-16

Steganographic encoding for video and images

#94
20100313278
2010-12-09

Associating first and second watermarks with audio or video content

#95
20100310118
2010-12-09

Printing media and methods employing digital watermarking

#96
20100296695
2010-11-25

Methods and systems for steganographic processing

#97
20100293276
2010-11-18

Methods for analyzing electronic media including video and audio

#98
20100290620
2010-11-18

Method and apparatus for modifying a subsequently generated control command in a content control system

#99
20100266157
2010-10-21

METHOD FOR EMBEDDING WATERMARK INTO AN IMAGE AND DIGITAL VIDEO RECORDER USING SAID METHOD

#100
20100235650
2010-09-16

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#101
20100226529
2010-09-09

Methods and apparatus to process imagery or audio content

#102
20100223477
2010-09-02

CONTENT REPRODUCING DEVICE, CONTENT REPRODUCING METHOD, RECORDING MEDIUM, AND INTEGRATED CIRCUIT

#103
20100215342
2010-08-26

Method and apparatus for reproducing video using watermark inserting function

#104
20100177891
2010-07-15

Digital video protection for authenticity verification

#105
20100172540
2010-07-08

Synchronizing rendering of multimedia content

#106
20100171880
2010-07-08

Method and apparatus for providing a content control signal via color burst phase modifications

#107
20100146286
2010-06-10

Pre-processed information embedding system

#108
20100134647
2010-06-03

Methods and systems for embedding camera information in images

#109
20100131767
2010-05-27

Methods for audio watermarking and decoding

#110
20100119108
2010-05-13

Methods and arrangements for composing information-carrying artwork

#111
20100040255
2010-02-18

Processing data representing video and audio and methods related thereto

#112
20100040228
2010-02-18

Personalized marking for protecting digital audiovisual streams

#113
20100034513
2010-02-11

Information burying device and detecting device

#114
20100034379
2010-02-11

Content assessment apparatus, content assessment method, information reproducing apparatus, and information reproducing method

#115
20100021004
2010-01-28

Hiding and detecting messages in media signals

#116
20100008537
2010-01-14

Embedding hidden auxiliary information in media

#117
20100008536
2010-01-14

Methods and systems for steganographic processing

#118
20100008534
2010-01-14

Methods for managing content using intentional degradation and insertion of steganographic codes

#119
20090310817
2009-12-17

WATERMARKING METHOD, WATERMARK CHECKING METHOD, WATERMARKING DEVICE, AND WATERMARK CHECKING DEVICE

#120
20090296823
2009-12-03

VIDEO CHARACTERISATION IDENTIFICATION AND SEARCH SYSTEM

#121
20090262975
2009-10-22

Deriving or calculating identifying data from video signals

#122
20090252401
2009-10-08

Methods, objects and apparatus employing machine readable data

#123
20090182997
2009-07-16

SYSTEM AND METHOD FOR DETECTING

#124
20090136029
2009-05-28

SYSTEM AND METHOD FOR CONTROLLING DISPLAY OF COPY-NEVER CONTENT

#125
20090132547
2009-05-21

Analyzing audio, including analyzing streaming audio signals

#126
20090113200
2009-04-30

STEGANOGRAPHIC TECHNIQUES FOR SECURELY DELIVERING ELECTRONIC DIGITAL RIGHTS MANAGEMENT CONTROL INFORMATION OVER INSECURE COMMUNICATION CHANNELS

#127
20090103900
2009-04-23

Acquiring high definition content through visual capture and re-compression

#128
20090070588
2009-03-12

RENEWABLE WATERMARK FOR THEATRICAL CONTENT

#129
20090067672
2009-03-12

Detecting hidden auxiliary code signals in media

#130
20090060265
2009-03-05

Processing data representing video and audio and methods and apparatus related thereto

#131
20090055650
2009-02-26

CONTENT PLAYBACK DEVICE, CONTENT PLAYBACK METHOD, CONTENT PLAYBACK PROGRAM, AND INTEGRATED CIRCUIT

#132
20090052735
2009-02-26

Methods and apparatus to process video and audio media

#133
20090028526
2009-01-29

INFORMATION RECORDING APPARATUS AND METHOD, COMPUTER PROGRAM, AND INFORMATION RECORDING MEDIUM

#134
20090028518
2009-01-29

Personalization of mass-duplicated media

#135
20090003650
2009-01-01

Method for selecting image pixels to watermark and watermarking method using this selection

#136
20080314974
2008-12-25

Data storage and access systems

#137
20080313741
2008-12-18

System and method for controlled copying and moving of content between devices and domains based on conditional encryption of content key depending on usage state

#138
20080303909
2008-12-11

Methods, systems and apparatus for setting a recording function of the recording apparatus in a restricted state

#139
20080301456
2008-12-04

Efficient Secure Forensic Watermarking

#140
20080276089
2008-11-06

Content authentication and recovery using digital watermarks

#141
20080253740
2008-10-16

Apparatus and methods to process video or audio

#142
20080226121
2008-09-18

Watermarking using multiple watermarks and keys, including keys dependent on the host signal

#143
20080226120
2008-09-18

Video watermarking using temporal analysis

#144
20080219494
2008-09-11

Method and system for watermark embedding in a multimedia system-on-chip

#145
20080159588
2008-07-03

Methods for marking images

#146
20080131084
2008-06-05

Steganographic encoding and detecting for video signals

#147
20080131083
2008-06-05

Audio encoding to convey auxiliary information, and media embodying same

#148
20080130941
2008-06-05

Watermark detection device

#149
20080130886
2008-06-05

Content security layer providing long-term renewable security

#150
20080130885
2008-06-05

Reproducing device, recording device, recording medium, data processing method, data processing program, data recording method, data recording program, and integrated circuit

#151
20080123899
2008-05-29

Methods for analyzing electronic media including video and audio

#152
20080109907
2008-05-08

Reproducing apparatus, recording apparatus and display apparatus

#153
20080098017
2008-04-24

Method and Device for Executing a Watermark-Embedded Content

#154
20080085054
2008-04-10

Method and systems for selecting test stimuli for use in evaluating performance of video watermarking methods

#155
20080049935
2008-02-28

Interpreter using cryptographic values of a playback device's keys to authorize the playback device

#156
20080049934
2008-02-28

Management Server Device, Content Repoduction Device, and Recording Medium

#157
20080048018
2008-02-28

Methods, objects and apparatus employing machine readable data

#158
20080037824
2008-02-14

Providing reports associated with video and audio content

#159
20080037781
2008-02-14

Content security layer providing long-term renewable security

#160
20080031596
2008-02-07

INTERFERING WITH ILLICIT RECORDING ACTIVITY

#161
20080031591
2008-02-07

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

#162
20080008446
2008-01-10

Method and apparatus for data reproduction

#163
20070294771
2007-12-20

METHOD AND SYSTEM OF COPY PROTECTION OF INFORMATION

#164
20070291979
2007-12-20

Efficient application of video marking technologies

#165
20070288715
2007-12-13

Media Player

#166
20070282749
2007-12-06

Content distribution system

#167
20070274523
2007-11-29

Watermarking to convey auxiliary information, and media embodying same

#168
20070274386
2007-11-29

Monitoring of video or audio based on in-band and out-of-band data

#169
20070248240
2007-10-25

Selective Video Blanking

#170
20070234391
2007-10-04

VIDEO DISTRIBUTION SYSTEM

#171
20070217493
2007-09-20

Documents and apparatus to encode documents

#172
20070201835
2007-08-30

Audio encoding to convey auxiliary information, and decoding of same

#173
20070195991
2007-08-23

Methods and systems for steganographic processing

#174
20070189530
2007-08-16

Management system for digital broadcast rights and a method thereof

#175
20070186272
2007-08-09

Video distribution system

#176
20070183624
2007-08-09

Methods and tangible objects employing machine readable data in photo-reactive materials

#177
20070177760
2007-08-02

Media and methods employing steganographic marking

#178
20070171761
2007-07-26

Methods and tangible objects employing machine readable data

#179
20070154064
2007-07-05

Watermarking compressed data

#180
20070140078
2007-06-21

Method and apparatus for reproducing content according to information embedded in the content

#181
20070130074
2007-06-07

Devices, systems and methods for restricting use of digital content

#182
20070098213
2007-05-03

Documents, articles and authentication of documents and articles

#183
20070071277
2007-03-29

Apparatus and method for embedding a watermark using sub-band filtering

#184
20070061585
2007-03-15

Watermark system

#185
20070053548
2007-03-08

Embedding hidden auxiliary code signals in media

#186
20070052560
2007-03-08

Bit-stream watermarking

#187
20070047765
2007-03-01

Methods and apparatus to process media

#188
20070047763
2007-03-01

Associating first and second watermarks with audio or video content

#189
20070033145
2007-02-08

Decoding apparatus for controlling sequence of operations for a plurality of copyright information detection sections

#190
20070031123
2007-02-08

Signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus

#191
20060291653
2006-12-28

Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus

#192
20060291652
2006-12-28

Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus

#193
20060285688
2006-12-21

Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus

#194
20060285687
2006-12-21

Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus

#195
20060282676
2006-12-14

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#196
20060271490
2006-11-30

Method of counteracting copying of digital information

#197
20060269096
2006-11-30

Method for performing recoverable video and image watermarking which survives block-based video and image compression

#198
20060265592
2006-11-23

Television broadcast receiver and television broadcast receiving method

#199
20060251291
2006-11-09

Methods and systems for inserting watermarks in digital signals

#200
20060251252
2006-11-09

Method and apparatus for modifying a subsequently generated control command in a content control system

#201
20060251251
2006-11-09

Embedding data in an information signal

#202
20060222073
2006-10-05

Authoring running marks in compressed data

#203
20060218604
2006-09-28

Method and apparatus for network content download and recording

#204
20060212908
2006-09-21

Video distribution system

#205
20060212892
2006-09-21

Video distribution system

#206
20060200416
2006-09-07

METHOD AND SYSTEM TO UNIQUELY ASSOCIATE MULTICAST CONTENT WITH EACH OF MULTIPLE RECIPIENTS

#207
20060195909
2006-08-31

Media player operable to decode content data

#208
20060195838
2006-08-31

Limiting distribution of copy-protected material to geographic regions

#209
20060195696
2006-08-31

Method and apparatus for enhanced audio/video services with watermarks and associated data

#210
20060195548
2006-08-31

Video distribution system

#211
20060188128
2006-08-24

Method and system for managing and controlling electronic media

#212
20060171559
2006-08-03

Authentication of identification documents

#213
20060159303
2006-07-20

Integrating digital watermarks in multimedia content

#214
20060146604
2006-07-06

Recording apparatus, recording method, recording medium and program

#215
20060136980
2006-06-22

Method and apparatus for displaying branded video tags

#216
20060133646
2006-06-22

Video steganography

#217
20060133645
2006-06-22

Steganographically encoded video, deriving or calculating identifiers from video, and related methods

#218
20060133644
2006-06-22

Recorded video broadcast, streaming, download, and disk distribution with watermarking instructions

#219
20060127039
2006-06-15

Method and apparatus for secure transfer of previously broadcasted content

#220
20060127037
2006-06-15

Method and apparatus for secure transfer and playback of multimedia content

#221
20060126888
2006-06-15

Method and arrangement for watermark detection

#222
20060126887
2006-06-15

Method and arrangement for watermark detection

#223
20060120525
2006-06-08

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

#224
20060118619
2006-06-08

Data storage and access systems

#225
20060109984
2006-05-25

Methods for audio watermarking and decoding

#226
20060080556
2006-04-13

Hiding and detecting messages in media signals

#227
20060075424
2006-04-06

Import control of content

#228
20060062386
2006-03-23

Steganographic encoding and decoding of auxiliary codes in media signals

#229
20060062073
2006-03-23

Recording medium and producing method thereof, reproducing method and reproducing apparatus, and copyright managing method

#230
20060053494
2006-03-09

Embedded revocation messaging

#231
20060005029
2006-01-05

Pre-processed information embedding system

#232
20050289064
2005-12-29

Personalized markup for protecting numerical audiovisual streams

#233
20050285944
2005-12-29

Recording apparatus, communications apparatus, recording system, communications system, and methods therefor

#234
20050283610
2005-12-22

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#235
20050280723
2005-12-22

Digital camera capable of embedding an electronic watermark into image data

#236
20050268105
2005-12-01

System and method of content copy control

#237
20050257075
2005-11-17

Data output method and apparatus, data playback method and apparatus, data recording method and apparatus, and data recording and playback method and apparatus

#238
20050246543
2005-11-03

System and method of content copy control

#239
20050244004
2005-11-03

Information data and management data processing apparatus and method

#240
20050238324
2005-10-27

Recording medium and production method, playback method, and playback device thereof

#241
20050232580
2005-10-20

Control of device operation within an area

#242
20050220321
2005-10-06

Watermark embedding

#243
20050219112
2005-10-06

Interfering with illicit recording activity

#244
20050210276
2005-09-22

Method and device for storing main information with associated additional information incorporated therein

#245
20050196013
2005-09-08

Methods and arrangements employing digital content items

#246
20050180599
2005-08-18

Methods and objects employing machine readable data

#247
20050180567
2005-08-18

System and method for controlling display of copy-never content

#248
20050166067
2005-07-28

Method and device for storing main information with associated additional information incorporated therein

#249
20050165814
2005-07-28

Method and device for storing main information with associated additional information incorporated therein

#250
20050152578
2005-07-14

Printing media and methods employing digital watermarking

#251
20050149735
2005-07-07

Watermark system

#252
20050147379
2005-07-07

Personalization of mass-duplicated media

#253
20050135614
2005-06-23

Method and apparatus for enhanced audio/video services with two watermarks

#254
20050123135
2005-06-09

Secure video system for display adaptor

#255
20050120218
2005-06-02

System and method for controlling contents by plurality of pieces of control information

#256
20050108542
2005-05-19

Watermarking with covert channel and permutations

#257
20050100188
2005-05-12

Embedding hidden auxiliary code signals in media

#258
20050094728
2005-05-05

Embedding supplemental data in a digital video signal

#259
20050091498
2005-04-28

Method and apparatus for content protection

#260
20050089192
2005-04-28

Watermark detection

#261
20050086488
2005-04-21

Information signal copy managing method, information signal recording method, information signal output apparatus, and recording medium

#262
20050078937
2005-04-14

Copyright protection system for data storage and transmission

#263
20050058318
2005-03-17

Embedding information in a digital image digitized from a developed photographic film

#264
20050058286
2005-03-17

Reproduction apparatus

#265
20050057769
2005-03-17

Information recording and reproducing apparatus, information recording and reproducing method and information recording and reproducing program

#266
20050053238
2005-03-10

Reducing problems caused by variations in watermark detection results

#267
20050050332
2005-03-03

Methods and systems for encoding and protecting data using digital signature and watermarking techniques

#268
20050036657
2005-02-17

Transform domain watermarking of image signals

#269
20050031161
2005-02-10

Coding apparatus and method, decoding apparatus and method, data processing system, storage medium, and signal

#270
20050031156
2005-02-10

Video steganography

#271
20050028192
2005-02-03

Access control for digital video stream data

#272
20050025463
2005-02-03

Method and apparatus for creating multiple unique copies of content

#273
20050018874
2005-01-27

Methods and apparatus to produce security documents

#274
20050018873
2005-01-27

Method and system for managing, accessing and paying for the use of copyrighted electronic media

#275
20050008334
2005-01-13

Methods for reading watermarks in unknown data types, and DVD drives with such functionality

#276
20050008324
2005-01-13

Interfering with illicit recording activity by emitting non-visible radiation

#277
20050008156
2005-01-13

Data coding

#278
10392627
2014-08-19

Method and system for marking digital content