| 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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| 06/29/2000 | CA2321048A1 Method for inserting a watermark signal into data |
| 06/28/2000 | EP1014318A2 Ticket issuing method, ticket issuing system and ticket collating method |
| 06/28/2000 | EP1013073A1 Method for generating and verifying degital watermarks and for exchanging data containing digital watermarks |
| 06/22/2000 | WO2000036785A1 Counterfeit deterrence system |
| 06/22/2000 | CA2355715A1 Counterfeit deterrence system |
| 06/21/2000 | EP1011269A1 System for processing an information signal |
| 06/21/2000 | CN2384285Y Secret ultra-low speed speech encoder-decoder |
| 06/15/2000 | WO2000035198A1 System for processing an information signal |
| 06/15/2000 | WO2000035144A1 Device for generating a descrambling signal |
| 06/15/2000 | CA2318131A1 Device for generating a descrambling signal |
| 06/14/2000 | EP1009126A1 Device for generating a descrambling signal |
| 06/14/2000 | EP1008097A1 Method and apparatus for watermarking video images |
| 06/14/2000 | CN1256579A Digital image coding/decoding device and method for recording and recovering signature image |
| 06/13/2000 | US6076078 Anonymous certified delivery |
| 06/08/2000 | WO2000033282A1 Combining multiple messages with different characteristics for watermarking |
| 06/07/2000 | EP1006710A2 Digital watermark embedding and detection devices |
| 06/06/2000 | US6072888 Method for image encoding |
| 05/31/2000 | EP1005230A2 Coding apparatus and method, decoding apparatus and method, data processing system, and storage medium |
| 05/31/2000 | EP1005040A1 Information signal copvright protection method, information signal recording method and device, and information signal output method and device |
| 05/30/2000 | US6069955 System for protection of goods against counterfeiting |
| 05/30/2000 | US6068190 Retro-reflective laser scanning head with rear reflector |
| 05/30/2000 | CA2184949C Secure spread spectrum watermarking for multimedia data |
| 05/26/2000 | CA2290309A1 Information signal copyright protection method, information signal recording method and device, and information signal output method and device |
| 05/24/2000 | EP1003127A2 Digital signature or electronic seal authentication system and recognized mark management program |
| 05/24/2000 | EP1002388A1 Apparatus and method for embedding and extracting information in analog signals using distributed signal features |
| 05/24/2000 | CN1254230A Digital image coding/decoding device using watermark and its method |
| 05/24/2000 | CN1254150A Method for controlling digital data and its device |
| 05/24/2000 | CN1254047A Magnetic cypher bock barrel capable of use one key to match with multiple lock, and key and its coding method |
| 05/23/2000 | US6066439 Instrument for photoerasable marking |
| 05/17/2000 | EP1001625A2 Method and apparatus for controlling digital data |
| 05/17/2000 | CN2378786Y Ciphering and deciphering radio transreceiving alarmer |
| 05/17/2000 | CN1253438A Digital sign or electron seal identification system and identification mark management sequence |
| 05/16/2000 | US6062481 Optimal error-detecting, error-correcting and other coding and processing, particularly for bar codes, and applications therefor such as counterfeit detection |
| 05/10/2000 | CN1252676A Digit image coding/decoding device and method using water mark |
| 05/10/2000 | CN1252567A Embedded information detecting method and system |
| 05/09/2000 | US6060223 Plastic article for colored printing and method for printing on a colored plastic article |
| 05/09/2000 | US6060200 Photo-erasable data processing forms and methods |
| 05/04/2000 | WO2000025510A1 Method for embedding electronic watermark and method for decoding the same |
| 05/04/2000 | WO2000025275A1 Machine-readable security document and method of preparing the same |
| 05/04/2000 | WO2000025203A1 Methods of digital steganography for multimedia data |
| 05/04/2000 | CA2348585A1 Machine-readable security document and method of preparing the same |
| 04/25/2000 | US6055321 System and method for hiding and extracting message data in multimedia data |
| 04/25/2000 | US6055313 Image processing system and image processing apparatus |
| 04/25/2000 | US6054256 Colorimetric analysis; detecting dosage radiation |
| 04/19/2000 | EP0994621A2 Signal conversion apparatus and method |
| 04/18/2000 | US6050491 Data collection terminal with components mounted on printed circuit boards therein |
| 04/13/2000 | DE19847942A1 Inserting security fingerprint into electronic documents by allocating point in hyperplane to each marking point in document |
| 04/12/2000 | CN1250201A Grating fingerprint antifake mark |
| 04/05/2000 | CN1249517A System for insertion of additional information in audio data |
| 04/04/2000 | US6047069 Method and apparatus for preserving error correction capabilities during data encryption/decryption |
| 03/29/2000 | EP0988591A1 Obfuscation techniques for enhancing software security |
| 03/23/2000 | WO2000016546A1 Method for embedding electronic watermark, recorded medium on which the method is recorded, method for proving embedded electronic watermark, and device for embedding electronic watermark |
| 03/23/2000 | WO2000016516A1 Watermarking of digital images using wavelet and discrete cosine transforms |
| 03/22/2000 | EP0987855A2 Method and apparatus for encoding audio with auxiliary digital data |
| 03/15/2000 | EP0946374A4 Tamper-evident form for securely carrying information |
| 03/09/2000 | WO2000013162A1 Encryption via user-editable multi-page file |
| 03/08/2000 | EP0984615A2 Document management method and apparatus, and recording medium therefor |
| 03/07/2000 | US6033465 Colorants and colorant modifiers |
| 03/01/2000 | EP0982930A2 Method for embedding information and device for the same |
| 03/01/2000 | EP0982927A1 Method of generating authentication-enabled electronic data |
| 03/01/2000 | EP0981903A2 Watermark detection |
| 03/01/2000 | EP0981902A2 Watermark detection |
| 03/01/2000 | EP0981901A2 Embedding auxiliary data in a signal |
| 03/01/2000 | EP0981900A2 Watermark detection |
| 03/01/2000 | CN1246239A Method and arrangement for detecting watermark |
| 02/16/2000 | EP0980179A1 Method of appending information to image and method of extracting information from image |
| 02/16/2000 | CN1244676A Information processing apparatus, method and its storage medium |
| 02/15/2000 | US6026193 Video steganography |
| 02/09/2000 | EP0978840A1 Method and system for controlling copy generations of digital data |
| 02/08/2000 | US6023511 Cryptosystem for encrypting digital image or voice file |
| 02/02/2000 | EP0977434A2 System for changing attribute of image by electronic watermark |
| 02/02/2000 | CN1243379A System of changing characteristic of picture through electronic watermark |
| 02/02/2000 | CN1243299A Cipher anti-fake method for products |
| 02/01/2000 | US6021199 Motion picture data encrypting method and computer system and motion picture data encoding/decoding apparatus to which encrypting method is applied |
| 02/01/2000 | US6021196 Reference palette embedding |
| 01/27/2000 | WO2000004727A2 Use of a watermark for the purpose of copy protection |
| 01/27/2000 | WO2000004713A1 Method and system for preventing unauthorized playback of broadcasted digital data streams |
| 01/27/2000 | WO2000004712A1 Use of a watermark for the purpose of copy protection |
| 01/27/2000 | WO2000004688A1 Method and apparatus for use of a watermark and a receiver dependent reference for the purpose of copy protection |
| 01/26/2000 | CN1242570A Recording and reproducing system, recording apparatus and reproducing apparatus having copy protection function |
| 01/25/2000 | US6017661 Substrate surface attached to merchandise and labeled with indicia comprising a mutable colorant, molecular includant and a transorber which irreversibly decolors colorant upon exposure to ultraviolet radiation |
| 01/25/2000 | US6017471 Colorants and colorant modifiers |
| 01/11/2000 | US6014228 Method and apparatus for delivering secured hard-copy facsimile documents |
| 01/06/2000 | WO2000000969A1 Apparatus and method for embedding and extracting information in analog signals using replica modulation |
| 01/06/2000 | CA2335975A1 Apparatus and method for embedding and extracting information in analog signals using replica modulation |
| 01/06/2000 | CA2276638A1 Method of providing digital contents, method of monitoring illegal use of digital contents, apparatus for providing digital contents, and apparatus for monitoring illegal use of digital contents |
| 01/05/2000 | EP0969463A1 Recording and reproducing system, recording apparatus and reproducing apparatus having copy protection function |
| 12/29/1999 | EP0967803A2 Robust digital watermarking |
| 12/29/1999 | EP0967783A2 Information processing apparatus, method and memory medium therefor |
| 12/19/1999 | CA2275672A1 Method and apparatus for superimposing additional information with image signal |
| 12/15/1999 | EP0792553B1 Method for certifying a copy of a document such as a fax |
| 12/09/1999 | WO1999063505A1 Method for data preparation and watermark insertion |
| 12/09/1999 | WO1999063443A1 Methods for embedding image, audio and video watermarks in digital data |
| 12/09/1999 | CA2334259A1 Method for data preparation and watermark insertion |
| 12/09/1999 | CA2273759A1 Copy generation management method, information signal reproducing method, information signal reproducing apparatus, and information signal recording apparatus |
| 12/09/1999 | CA2273758A1 Information signal reproducing apparatus, information signal outputting apparatus, information signal reproducing method, and information signal outputting method |
| 12/07/1999 | CA2169553C System and method for key distribution using quantum cryptography |
| 12/07/1999 | CA2169552C Key distribution in a multiple access network using quantum cryptography |
| 12/02/1999 | WO1999062044A1 Reference palette embedding |
| 12/02/1999 | DE19920045A1 Electron watermark implemented receiver for broadcast system |