| Patents for G09C 5 - Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages (2,737) |
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| 07/29/2004 | US20040145661 Image processing method, and image processing apparatus |
| 07/28/2004 | EP1440434A2 Method and apparatus for the encryption of data |
| 07/28/2004 | CN1516169A Copy control method |
| 07/28/2004 | CN1516168A Recording method and equipment reprdoucing method and equipment |
| 07/28/2004 | CN1516167A Recording medium |
| 07/28/2004 | CN1159902C Method for embedding digital watermark and method for decoding the same |
| 07/27/2004 | US6769061 Invisible encoding of meta-information |
| 07/27/2004 | US6768807 Digital watermark embedding device, digital watermark detection device, digital information distribution device, and, storage medium |
| 07/22/2004 | WO2004062261A2 Methods and apparatus for interactive network sharing of digital video content |
| 07/22/2004 | WO2004061798A1 Methods and apparatus for interactive map-based analysis of digital video content |
| 07/22/2004 | US20040141210 Method and apparatus for halftone image embedding |
| 07/15/2004 | WO2004038531A9 Watermark insertion apparatus and watermark extraction apparatus |
| 07/14/2004 | EP1436997A2 Encoding and encrypting devices for secure scalable data streaming |
| 07/14/2004 | EP1163117A4 Improved tamper-evident form |
| 07/08/2004 | US20040131228 Watermarking an information signal |
| 07/08/2004 | US20040130142 Event entry and advertising medium |
| 07/07/2004 | CN1510681A Duplicating protective system and method for digital signal |
| 07/07/2004 | CN1510680A Duplicating protective system and method for digital signal |
| 07/07/2004 | CN1510679A Duplicating protective system and method for digital signal |
| 07/07/2004 | CN1156846C Data reproducing method and apparatus, and data processing system |
| 07/07/2004 | CN1156844C Recording method and apparatus, reproducing method and apparatus |
| 07/01/2004 | WO2004055757A1 Key synchronization in a visual cryptographic system |
| 07/01/2004 | US20040125133 Methods and apparatus for interactive network sharing of digital video content |
| 07/01/2004 | US20040125121 Methods and apparatus for interactive map-based analysis of digital video content |
| 06/30/2004 | CN1156155C Method and device for watermark |
| 06/30/2004 | CN1155866C Method and apparatus for protection of softward against use without permit |
| 06/29/2004 | US6757405 Digital watermark embedding device, digital watermark detection device and recording medium recording computer readable program for realizing functions of two devices |
| 06/29/2004 | US6755346 Usage dependent ticket to protect copy-protected material |
| 06/24/2004 | US20040120523 Watermark embedding method and arrangement |
| 06/23/2004 | EP1432234A1 Systems and methods for providing hardcopy secure documents and for validation of such documents |
| 06/23/2004 | CN1506921A Method of making credit card and deposit book possess alarm function and less money loss |
| 06/22/2004 | US6754364 Methods and systems for fingerprinting digital data |
| 06/17/2004 | WO2004051442A1 Key synchronization in an image cryptographic systems |
| 06/17/2004 | US20040117627 Systems and methods for providing hardcopy secure documents and for validation of such documents |
| 06/16/2004 | CN1154105C System and method for copy protection for digital signals |
| 06/16/2004 | CN1154080C Grating fingerprint antifake mark |
| 06/15/2004 | US6751336 Digital authentication with digital and analog documents |
| 06/15/2004 | US6751335 Method for generating a dispersed message for data embedding |
| 06/10/2004 | US20040111603 Document administration apparatus, document administration method, computer program, and computer-readable memory medium |
| 06/09/2004 | CN1153456C Water-mark detection method and apparatus |
| 06/03/2004 | US20040107347 Content distribution system, content distribution method and terminal device |
| 06/02/2004 | EP1423764A2 Copy protection via multiple tests |
| 06/02/2004 | CN1502069A Copy protection via multiple tests |
| 06/02/2004 | CN1152355C Print method of holographic image or words |
| 06/02/2004 | CN1152347C Anti-counterfeiting method and apparatus using digital screening |
| 05/27/2004 | US20040103285 System for transmitting and receiving encrypted information |
| 05/27/2004 | US20040101282 Recording and reproducing system, recording apparatus and reproducing apparatus having copy protection function |
| 05/27/2004 | US20040101201 Systems for spectral multiplexing of source images to provide a composite image, for rendering the composite image, and for spectral demultiplexing of the composite image by use of an image capture device |
| 05/26/2004 | EP1269431B1 Method for protecting an electronic chip against fraud |
| 05/26/2004 | CN1151630C Digital sign or electron seal indentification system and identification mark management sequence |
| 05/25/2004 | US6741722 Verification data encoding method, original image verification method and apparatus, and computer readable medium |
| 05/20/2004 | US20040098593 Digital watermark embedding apparatus and method, and digital watermark analysis apparatus, method and program |
| 05/20/2004 | US20040096058 Apparatus and method for encrypting/decrypting information on basic element by element basis and encryption/decryption system using the same |
| 05/19/2004 | CN1150715C Electronic mark issuing method and system and identification device of electronic mark |
| 05/18/2004 | US6738493 Robust digital watermarking |
| 05/18/2004 | US6738492 Coding apparatus and method, decoding apparatus and method, data processing system, storage medium, and signal |
| 05/18/2004 | CA2332182C Secure holographic images on paper |
| 05/13/2004 | WO2004040903A1 Image decryption device and method |
| 05/12/2004 | CN1496102A Image processing equipment |
| 05/12/2004 | CN1149839C Use of a watermark for the purpose of copy protection |
| 05/11/2004 | CA2318509C System and method for copy protection for digital signals |
| 05/06/2004 | WO2004038531A2 Watermark insertion apparatus and watermark extraction apparatus |
| 05/06/2004 | US20040088549 Method and apparatus for using contents |
| 05/06/2004 | EP1416486A1 Information recording device, information reproducing device, information recording method, information reproducing method, and computer program |
| 05/05/2004 | CN1493481A Automobile license plate coding making method |
| 05/05/2004 | CN1148970C Digit image coding/decoding device and method using watermark |
| 05/05/2004 | CN1148949C Digital image coding/decoding device using watermark and its method |
| 04/28/2004 | CN2613845Y Coder hollow axle with arc on opening of axle end |
| 04/28/2004 | CN1492387A Novel common key cipher system and its improved type |
| 04/27/2004 | US6728376 System for encrypting documents with stencils |
| 04/21/2004 | CN1147142C Signal conversion equipment and method |
| 04/21/2004 | CN1147123C System of changing characteristic of picture through electronic watermark |
| 04/20/2004 | US6724911 Robust digital watermarking |
| 04/15/2004 | US20040071366 Systems for spectral multiplexing of source images to provide a composite image, for rendering the composite image, and for spectral demultiplexing the composite image, which achieve increased dynamic range in a recovered source image |
| 04/15/2004 | US20040071359 Systems for spectral multiplexing of source images to provide a composite image, for rendering the composite image, and for spectral demultiplexing of the composite image |
| 04/15/2004 | US20040071339 Systems for spectral multiplexing of a source image and a background image to provide a composite image, for rendering the composite image, and for spectral demultiplexing of the composite images |
| 04/15/2004 | US20040071314 Methods and systems for fingerprinting digital data |
| 04/15/2004 | US20040071310 Systems for spectral multiplexing of source images to provide a composite image with gray component replacement, for rendering the composite image, and for spectral demultiplexing of the composite image |
| 04/14/2004 | EP1408473A2 Systems for spectral multiplexing, rendering, and demultiplexing of source images |
| 04/14/2004 | EP1408472A2 Systems for spectral multiplexing of source images to provide a composite image, for rendering the composite image, and for spectral demultiplexing of the composite image |
| 04/14/2004 | EP1407344A1 Electronic vouchers and a system and method for issuing the same |
| 04/13/2004 | US6721437 Data processing apparatus, coding apparatus, data processing method and coding method |
| 04/07/2004 | EP1405251A1 Digital authentication with digital and analog documents |
| 03/30/2004 | US6714659 Watermarking an information signal |
| 03/30/2004 | CA2097359C Record with encoded data |
| 03/24/2004 | EP1400371A1 ID card, ID card issuing device, and ID card reading device |
| 03/24/2004 | CN1484196A ID card, ID card issuing device, and ID card reading device |
| 03/24/2004 | CN1143532C Method and arrangement for detecting watermark |
| 03/18/2004 | WO2003098406A3 System and method for digital watermarking of data repository |
| 03/18/2004 | US20040052400 Electronic document, genuineness management method for print medium thereof, genuineness management system, program, and program recording medium |
| 03/18/2004 | US20040050931 ID card, ID card issuing device, and ID card reading device |
| 03/16/2004 | US6707930 Method and arrangement for embedding a watermark in an information signal |
| 03/16/2004 | US6707927 Steganographic system, method, program and storage medium therefor |
| 03/16/2004 | US6707774 Recording and reproducing system, recording apparatus and reproducing apparatus having copy protection function |
| 03/04/2004 | US20040045034 Video program broadcasting apparatus, method, and program |
| 03/03/2004 | EP1394796A2 Information transmitting method |
| 03/02/2004 | US6700993 System and method for on-line digital watermark detection |
| 03/02/2004 | CA2239086C Digital anti-counterfeiting software method and apparatus |
| 02/24/2004 | US6697499 Digital watermark inserting system and digital watermark characteristic parameter table generating method |
| 02/19/2004 | WO2004015581A1 Digital content with information of latent value to purchaser and method for making the same |