| 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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| 02/06/2003 | US20030028487 Print control method using electronic watermark information |
| 02/06/2003 | US20030026451 Method and system for encoding image and audio content |
| 02/06/2003 | US20030026450 Protecting images with image markings |
| 02/06/2003 | US20030026421 Method for transmitting data with digital watermark access control and devices therefor |
| 02/06/2003 | US20030025805 Image sensing apparatus, image processing apparatus and method, and image processing system |
| 02/05/2003 | EP1282074A2 Standards compliant watermarking for access management |
| 02/05/2003 | EP1282073A2 Technique of embedding and detecting digital watermark |
| 02/05/2003 | CN1100679C Improved touching-proof structure |
| 02/04/2003 | US6515762 Image processing and method, and storage medium |
| 02/04/2003 | CA2276378C Robust digital watermarking |
| 01/30/2003 | WO2002060110A3 Apparatus, method, and system for accessing digital rights management information |
| 01/30/2003 | US20030021440 Digital watermarking employing noise model |
| 01/30/2003 | US20030021439 Secure robust high-fidelity watermarking |
| 01/29/2003 | EP1279280A1 Method and device for controlling multimedia data watermark |
| 01/29/2003 | CN1394313A Method for embedding and extracting text into/from electronic documents |
| 01/29/2003 | CN1393837A Carved picture for antiforge certificate and its making method |
| 01/29/2003 | CN1393836A Method for writing intaglio-printed Japanese characters and normalized Arabic numerals |
| 01/28/2003 | US6512835 Data hiding and extraction methods |
| 01/23/2003 | WO2003007252A1 Method for generation of authentication information and use thereof |
| 01/23/2003 | WO2001084283A3 Network enabled application software system and method |
| 01/23/2003 | US20030016825 System and method for secure watermarking of a digital image sequence |
| 01/23/2003 | US20030016824 Method and apparatus for use of a time-dependent watermark for the purpose of copy protection |
| 01/16/2003 | US20030014363 Electronic vouchers and a system and method for issuing the same |
| 01/16/2003 | US20030012405 Unfair contents appropriation detection system, computer program and storage medium |
| 01/16/2003 | US20030012404 Digital watermark embedding device and digital watermark embedding method |
| 01/16/2003 | US20030012402 Technique of embedding and detecting digital watermark |
| 01/16/2003 | US20030012376 Encoding devices for scalable data streaming |
| 01/15/2003 | EP1276329A2 System and method for secure watermarking of a digital image sequence |
| 01/15/2003 | CN1099070C 数据控制系统 Data Control System |
| 01/09/2003 | US20030009674 Method and apparatus for detecting data |
| 01/07/2003 | US6505223 Watermark detection |
| 01/03/2003 | WO2003001363A1 Electronic vouchers and a system and method for issuing the same |
| 01/03/2003 | CA2451616A1 Electronic vouchers and a system and method for issuing the same |
| 01/02/2003 | US20030005302 Theft resistant graphics |
| 01/02/2003 | EP1271401A2 Method and apparatus for detecting data |
| 01/02/2003 | EP1269741A1 Method for transmitting data with digital watermark access control and devices therefor |
| 01/02/2003 | EP1269740A1 Digital computer systems |
| 01/02/2003 | EP1269431A1 Method for protecting an electronic chip against fraud |
| 01/01/2003 | CN1389070A Digital watermarking for multimedia data |
| 01/01/2003 | CN1388929A Watermark detector |
| 01/01/2003 | CN1097945C Digital antifaking method and apparatus |
| 01/01/2003 | CN1097788C Software reproduction apparatus |
| 12/19/2002 | US20020194492 Method of protecting and managing digital contents and system for using thereof |
| 12/19/2002 | US20020194134 Image encrypting method and device, image decrypting method and device, and recording medium |
| 12/18/2002 | CN1385853A Data output, replay, record and method and equipment for record and replay |
| 12/18/2002 | CN1385823A Ticket and security ciphering and identifying method based on identified fibre random distribution |
| 12/17/2002 | US6496591 Video copy-control with plural embedded signals |
| 12/12/2002 | WO2002099735A1 Digital authentication with digital and analog documents |
| 12/12/2002 | WO2002059724A9 Apparatus, method and system for tracking information access |
| 12/12/2002 | WO2001078386A3 Data scrambling and descrambling system |
| 12/11/2002 | EP1264436A1 Method and system to uniquely associate multicast content with each of multiple recipients |
| 12/11/2002 | CN1384500A Copying control method, copying control device and copying control program for record medium |
| 12/05/2002 | US20020181740 Image capture and marking |
| 12/05/2002 | US20020181738 Digital watermark embedding processor, digital watermark detecting processor, digital watermark embedding-processing method, digital watermark detecting-processing method, and program storage medium and program used therewith |
| 12/05/2002 | US20020181706 Digital watermark embedding device and digital watermark embedding method |
| 12/04/2002 | EP1261969A1 Device for reading, recording and restoring digital data in a copy-protection system for said data |
| 12/04/2002 | EP1173980B1 Method for inserting a watermark into an image |
| 12/04/2002 | CN1383558A Contents data, recording medium, recording method and device, reproducing method and device |
| 12/04/2002 | CN1383528A Watermark embedding method and arrangement |
| 12/04/2002 | CN1095575C Data hiding method and data extracting method and its system |
| 12/03/2002 | US6490681 Electronic watermarking system |
| 12/03/2002 | US6490355 Method and apparatus for use of a time-dependent watermark for the purpose of copy protection |
| 11/28/2002 | US20020176602 Method of integrating a watermark into a compressed image |
| 11/28/2002 | US20020176601 Audio with hidden in-band digital data |
| 11/27/2002 | EP1259961A2 System and method for protecting digital media |
| 11/27/2002 | CN1381803A Data processing method for application with photo and its system |
| 11/26/2002 | US6487301 Digital authentication with digital and analog documents |
| 11/21/2002 | US20020172398 Image processing apparatus and method, program code and storage medium |
| 11/21/2002 | US20020172394 Robust and stealthy video watermarking |
| 11/21/2002 | US20020171862 Print sheet original authentication system, printer device and checking device |
| 11/20/2002 | EP1257921A1 Watermark encoder and decoder enabled software and devices |
| 11/20/2002 | CN2521688Y Antifake sign |
| 11/20/2002 | CN1381141A Watermarked material processing |
| 11/20/2002 | CN1381051A Recording medium, recording method of recording medium, recording and/or reproducing method of recording medium and data copy control method |
| 11/20/2002 | CN1381023A Identifying material |
| 11/19/2002 | CA2309623C Tamper-evident form for securely carrying information |
| 11/13/2002 | EP1256906A2 Image processing method |
| 11/13/2002 | CN1379951A 数字计算机系统 Digital computer system |
| 11/12/2002 | US6480607 Encrypted data reproducing transmitting and processing method and apparatus with separately encrypted control data |
| 11/07/2002 | WO2002089096A1 Apparatus and method for encrypting/decrypting information on basic element-by-basic element basis and encryption/decryption system using the same |
| 11/07/2002 | WO2002088991A1 Method of protecting and managing digital contents and system for using thereof |
| 11/07/2002 | US20020164050 Audio appliance and monitoring device responsive to watermark data |
| 11/07/2002 | US20020164045 Receiving apparatus, transmitting apparatus , and communication system which utilize a watermark insertion technique |
| 11/07/2002 | US20020164021 Apparatus and method for enhancing the security of negotiable instruments |
| 11/07/2002 | US20020163671 Apparatus and method for processing image and computer-readable storage medium |
| 11/05/2002 | US6477431 Watermark detection |
| 10/31/2002 | WO2001061508A9 Watermark encoder and decoder enabled software and devices |
| 10/30/2002 | EP1253784A2 Derivation and quantization of robust non-local characteristics for blind watermarking |
| 10/30/2002 | EP1253740A1 Content data transmitting device and method, and recording/reproducing device |
| 10/30/2002 | EP1253555A2 Robust and stealthy video watermarking |
| 10/30/2002 | EP1253503A2 Protection of software against use without permit |
| 10/30/2002 | CN1093665C Data hiding method and data extraction method using statistical examination |
| 10/24/2002 | US20020156742 Information signal reproducing apparatus, information signal outputting apparatus, information signal reproducing method, and information signal outputting method |
| 10/24/2002 | US20020154778 Derivation and quantization of robust non-local characteristics for blind watermarking |
| 10/23/2002 | EP0880840A4 System for controlling access and distribution of digital property |
| 10/23/2002 | CN2518174Y Raster anti-fraud device |
| 10/22/2002 | US6470090 Digital watermark insertion system and digital watermark characteristic table creating device |
| 10/17/2002 | WO2002060112A3 Apparatus, method and system for multiple resolution affecting information access |
| 10/17/2002 | US20020150277 Method and system for generating data of an application with a picture |
| 10/16/2002 | CN1374628A Distortion-free data-hiding method |