| 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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| 09/05/2001 | EP1130917A2 Copyright protected signal transmission apparatus and signal transmission method |
| 09/05/2001 | EP1130500A2 System and method for distribution and monitoring of copyrighted data |
| 09/05/2001 | CN1311582A Signalling device and signalling method |
| 09/05/2001 | CN1311581A Method and device for computerized voice data hidden |
| 09/04/2001 | US6286100 Method for hiding message data into media data and a method for extracting that hidden data |
| 08/30/2001 | US20010018742 Content distribution system, content distribution method, content distribution status monitoring apparatus and method, and content using apparatus and method |
| 08/30/2001 | US20010018741 Method and apparatus for performing data encryption and error code correction |
| 08/30/2001 | US20010017931 Method and apparatus for watermarking video images |
| 08/30/2001 | US20010017828 Multimedia copy control system and method using digital data recording medium and optical disc reproducing apparatus |
| 08/23/2001 | WO2001061508A1 Watermark encoder and decoder enabled software and devices |
| 08/23/2001 | US20010016049 Determination of a segmentation of a digital signal for inserting watermarking signals and the associated insertion |
| 08/22/2001 | EP1126453A2 Multimedia copy control system and method using digital data recording medium and optical disc reproducing apparatus |
| 08/22/2001 | EP1125257A1 Machine-readable security document and method of preparing the same |
| 08/22/2001 | EP1125189A1 Methods of digital steganography for multimedia data |
| 08/21/2001 | US6278792 Robust digital watermarking |
| 08/21/2001 | CA2207607C Photo-erasable data processing forms |
| 08/16/2001 | WO2001059705A2 Protecting content from illicit reproduction by proof of existence of a complete data set via self-referencing sections |
| 08/16/2001 | EP1123814A2 Method and apparatus for indicating ultraviolet light exposure |
| 08/16/2001 | EP1123813A2 Instrument for photoerasable marking |
| 08/16/2001 | EP1123812A2 Article for colored printing and method for printing |
| 08/16/2001 | EP1123811A2 Photoerasable paint and method for using photoerasable paint |
| 08/16/2001 | EP0830676B1 Digital information recording media and method of using same |
| 08/15/2001 | CN1308331A Digital data copying controlling system and method and CD playback device and storage medium |
| 08/09/2001 | WO2001057869A2 Protecting content from illicit reproduction by proof of existence of a complete data set |
| 08/09/2001 | US20010012377 Steganographically encoding a first image in accordance with a second image |
| 08/09/2001 | CA2369082A1 Protecting content from illicit reproduction by proof of existence of a complete data set |
| 08/08/2001 | EP1122729A1 Data recorded medium, data reproducing method and reproducing apparatus, and data processing system |
| 08/07/2001 | US6272222 Method of and apparatus for manipulating digital data works |
| 08/01/2001 | EP1120291A2 Tamper-evident form for securely carrying information |
| 08/01/2001 | CN1306664A Usage dependent ticket to protect copy-protected material |
| 08/01/2001 | CN1306266A Gene identity card and its preparing process |
| 08/01/2001 | CN1306265A Sell-promoting product and its application method |
| 07/31/2001 | US6268866 Digital watermarking system for making a digital watermark with few colors of input image |
| 07/26/2001 | WO2001054396A1 Invisible encoding of meta-information |
| 07/26/2001 | WO1997049235A8 Data hiding method and data extracting method |
| 07/26/2001 | US20010009581 Electronic watermark detecting/inserting device |
| 07/24/2001 | US6266430 Audio or video steganography |
| 07/24/2001 | US6266416 Protection of software against use without permit |
| 07/18/2001 | EP1117071A1 Determination of a segmentation of a digital signal for inserting watermarking signals and the associated insertion. |
| 07/18/2001 | EP1116708A1 A method of dehydrating a tertiary alcohol |
| 07/05/2001 | WO2001048682A1 Digital watermarks as data proxies |
| 07/04/2001 | EP1112636A1 Watermarking of digital images using wavelet and discrete cosine transforms |
| 07/03/2001 | US6256736 Secured signal modification and verification with privacy control |
| 07/03/2001 | CA2219205C Digital watermarking |
| 06/28/2001 | US20010005423 Steganographic system with changing operations |
| 06/27/2001 | EP1110400A1 Method and system for protecting digital data from unauthorized copying |
| 06/26/2001 | US6252972 Method and arrangement for detecting a watermark using statistical characteristics of the information signal in which the watermark is embedded |
| 06/26/2001 | US6252961 Method and apparatus for performing data encryption and error code correction |
| 06/21/2001 | US20010004736 Method for facilitating legitimate use of digital content |
| 06/20/2001 | CN1300428A System and method for copy protection for digital signals |
| 06/19/2001 | US6249870 Data hiding method and data extraction method using statistical examination |
| 06/14/2001 | WO2001043080A1 Secure photo carrying identification device, as well as means and method for authenticating such an identification device |
| 06/14/2001 | CA2393642A1 Secure photo carrying identification device, as well as means and method for authenticating such an identification device |
| 06/12/2001 | US6246775 Method and appartus for superposing a digital watermark and method and apparatus for detecting a digital watermark |
| 06/05/2001 | US6243480 Digital authentication with analog documents |
| 05/30/2001 | EP1103026A1 Methods for embedding image, audio and video watermarks in digital data |
| 05/30/2001 | CN1297558A Apparatus and method for signal processing |
| 05/29/2001 | US6240121 Apparatus and method for watermark data insertion and apparatus and method for watermark data detection |
| 05/25/2001 | WO2001037278A1 Recording medium, data recording method and apparatus, data reproducing method and apparatus, and copying control method |
| 05/24/2001 | US20010001613 Video-data encoder and recording media wherein a video-data encode program is recorded |
| 05/22/2001 | US6235095 Ink for inkjet printers |
| 05/16/2001 | CN2430747Y Anti-leakage of secret device special for cipher input device |
| 05/16/2001 | CN1295695A Method and apparatus for encoding image information into puzzle-type |
| 05/15/2001 | US6233340 Apparatus and method for enhancing the security of negotiable documents |
| 05/15/2001 | US6231082 Tamper-evident form for securely carrying information |
| 05/09/2001 | CN2429396Y Device for encoding and decoding angular position of engine |
| 05/08/2001 | US6229924 Method and apparatus for watermarking video images |
| 05/03/2001 | WO2001031910A1 Methods and systems for fingerprinting digital data |
| 05/02/2001 | EP1095376A1 Apparatus and method for embedding and extracting information in analog signals using replica modulation |
| 05/02/2001 | EP0813788B1 Method of and apparatus for manipulating digital data works |
| 04/26/2001 | WO2001030064A1 Image and video authentication system |
| 04/26/2001 | WO2001029790A1 Product verification system |
| 04/25/2001 | EP1094660A2 Embedding information in a halftoned digital image |
| 04/25/2001 | EP0946374B1 Tamper-evident form for securely carrying information |
| 04/24/2001 | US6220633 Tamper-evident form for securely carrying information |
| 04/18/2001 | EP1093104A1 Method and apparatus for signal processing |
| 04/11/2001 | CN1290914A Method for producing anti-fake encrpted bar code of postage label |
| 04/11/2001 | CN1290913A Cipher anti-fake method of high security |
| 04/10/2001 | US6215421 Coding apparatus and method, decoding apparatus and method, data processing system, and storage medium |
| 04/05/2001 | WO2001023981A1 Authentification of digital data works using signatures and watermarks |
| 04/04/2001 | EP1088296A1 Method for data preparation and watermark insertion |
| 04/04/2001 | CN1290454A System for processing and information signal |
| 04/04/2001 | CN1290441A Device for generating a descrambling signal |
| 04/03/2001 | US6211383 Reacting the compound in a non-aqueous non-polar solvent in the presence of a transition metal salt such that the hydroxy group is dehydrated |
| 03/27/2001 | US6208745 Method and apparatus for imbedding a watermark into a bitstream representation of a digital image sequence |
| 03/21/2001 | EP1008097A4 Method and apparatus for watermarking video images |
| 03/15/2001 | WO2001019072A1 Digital computer systems |
| 03/15/2001 | CA2383954A1 Digital computer systems |
| 03/14/2001 | EP1082723A1 Usage dependent ticket to protect copy-protected material |
| 03/14/2001 | CN1287357A Recording medium using for content data and reproducing equipment using the same |
| 03/14/2001 | CN1287341A Product number enciphering anti-fake system and method |
| 03/13/2001 | US6201881 Embedding information in three-dimensional geometric model |
| 03/07/2001 | EP1081936A2 Digital camera, and system for detecting falsification of an image |
| 03/07/2001 | EP1081912A2 Method and system for distributing multimedia data with management information |
| 03/01/2001 | WO2001015164A1 Data recorded medium, data reproducing method and reproducing apparatus, and data processing system |
| 02/28/2001 | CN1285789A Tamper-evident form for securely carrying information |
| 02/14/2001 | EP1075757A1 Digital authentication with analog documents |
| 02/14/2001 | CN1284192A Electronic watermark applied to one-dimensional data |
| 02/07/2001 | EP1074110A1 Process for transmitting, receiving and/or storing information |
| 02/07/2001 | CN1283040A Method and system of distributing multimedia data using management information |