| 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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| 05/26/1995 | WO1995014289A2 Identification/authentication coding method and apparatus |
| 05/03/1995 | EP0651554A1 Method and apparatus for the addition and removal of digital watermarks in a hierarchical image storage and retrieval system |
| 04/19/1995 | EP0648162A1 Copy preventing device and method |
| 04/11/1995 | CA2041761C Method for obtaining a secure confirmation in a distributed computer system environment |
| 04/06/1995 | WO1995009410A1 Enciphering/deciphering device and method and enciphering/deciphering communication system |
| 04/04/1995 | US5404001 Fiber optic barcode reader |
| 03/28/1995 | US5401944 Traveler security and luggage control system |
| 03/16/1995 | WO1995007585A1 Method for key distribution using quantum cryptography |
| 03/16/1995 | WO1995007584A1 System and method for quantum cryptography |
| 03/16/1995 | WO1995007583A1 System and method for key distribution using quantum cryptography |
| 03/16/1995 | WO1995007582A1 Key distribution in a multiple access network using quantum cryptography |
| 03/14/1995 | US5398283 Encryption device |
| 03/07/1995 | US5396559 Anticounterfeiting method and device utilizing holograms and pseudorandom dot patterns |
| 03/07/1995 | US5396055 Hand held bar code reader with keyboard, display and processor |
| 02/28/1995 | US5393965 Flexible merchandise checkout and inventory management system |
| 02/16/1995 | WO1995004955A1 Mutable composition and methods of use thereof |
| 02/16/1995 | CA2168727A1 Mutable composition and methods of use thereof |
| 02/09/1995 | WO1995004428A1 Apparatus and method for creating and transmitting confidential documents |
| 02/07/1995 | US5388194 System for altering elements of a text file to mark documents |
| 02/07/1995 | US5388158 Secure document and method and apparatus for producing and authenticating same |
| 02/06/1995 | CA2120838A1 Solid colored composition mutable by ultraviolet radiation |
| 12/21/1994 | EP0629972A2 Method and apparatus for embedding identification codes in printed documents |
| 12/13/1994 | US5373558 Desinated-confirmer signature systems |
| 11/30/1994 | EP0401258B1 Document marking system |
| 11/22/1994 | US5367148 Counterfeit detection using ID numbers with at least one random portion |
| 11/01/1994 | US5360235 Secret optical marking |
| 10/11/1994 | CA1332469C Electronic indicia in bit-mapped form |
| 09/27/1994 | US5350199 Security facsimile paper |
| 09/14/1994 | CN1092191A Record with removable two-dimensional code |
| 08/24/1994 | EP0611470A1 Optical image encryption and decryption processes |
| 08/09/1994 | US5337362 Method and apparatus for placing data onto plain paper |
| 08/09/1994 | US5337361 Record with encoded data |
| 08/02/1994 | CA1331213C Public key/signature cryptosystem with enhanced digital signature certification |
| 07/19/1994 | US5331436 Encoder and decoder |
| 06/14/1994 | US5321749 Encryption device |
| 06/14/1994 | US5321246 Bar code scanner with RF coupling to base terminal and automatic turn-off upon decode |
| 06/08/1994 | EP0600646A2 Secure document and method and apparatus for producing and authenticating same |
| 06/01/1994 | EP0599558A2 Secure identification card and method and apparatus for producing and authenticating same |
| 05/31/1994 | CA1329953C Polygonal information encoding article, process and system |
| 05/26/1994 | DE3943563C2 Polygonal information encoding article, process and system |
| 05/25/1994 | EP0598572A2 Anti-counterfeiting process using lenticular optics and color masking |
| 05/25/1994 | EP0598357A1 Process for transmitting and/or storing information |
| 05/25/1994 | CN1087191A Record with encoded data |
| 05/25/1994 | CN1087190A Fiber optic barcode readers |
| 05/18/1994 | EP0597192A2 Method for enabling later verification of already transmitted data |
| 05/17/1994 | US5313564 Graphic matter and process and apparatus for producing, transmitting and reading the same |
| 05/16/1994 | CA2102952A1 Process for transmitting and/or storing information |
| 04/20/1994 | EP0592595A1 Ciphering device |
| 04/19/1994 | US5304787 Locating 2-D bar codes |
| 04/16/1994 | CA2080610A1 Apparatus for receiving and storing transmitted data in a confidential manner |
| 04/13/1994 | EP0591848A1 Fiber optic bar code reader |
| 04/12/1994 | US5303370 Anti-counterfeiting process using lenticular optics and color masking |
| 04/12/1994 | US5301981 Copy preventing device and method |
| 03/31/1994 | WO1994007326A1 Encryption device |
| 03/31/1994 | DE4230527A1 Data transmission procedure - using inaccuracies in data content occurring through scanning of data source as modulation content for transmission of data |
| 03/22/1994 | US5297207 Machine generation of cryptographic keys by non-linear processes similar to processes normally associated with encryption of data |
| 03/22/1994 | US5296693 Ink intrusion resistant digital code |
| 03/17/1994 | DE4016624C1 Anordnung zur Fernbedienung in Datennetzen Arrangement for remote control in data networks |
| 03/09/1994 | EP0586022A1 Improved public key/signature cryptosystem with enhanced digital signature certification field |
| 02/15/1994 | US5287203 Apparatus for encoding and decoding information on recording medium |
| 02/02/1994 | EP0581317A2 Method and system for digital image signatures |
| 02/01/1994 | US5283422 Information transfer and use, particularly with respect to counterfeit detection |
| 01/20/1994 | WO1994001288A1 Copy preventing device and method |
| 01/11/1994 | US5278903 Information processing system |
| 12/29/1993 | EP0575989A2 Record with removable two-dimensional code |
| 12/28/1993 | US5274466 Encoder including an error decision circuit |
| 12/15/1993 | EP0573406A1 Program transmission optimisation. |
| 12/08/1993 | EP0573129A2 Polygonal information encoding article, process and system |
| 12/08/1993 | EP0572989A2 Record with encoded data |
| 11/16/1993 | US5262628 Narrow-bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols |
| 11/02/1993 | US5259031 Sheets for concealing information recorded on recording paper for use with a facsimile and method of concealing information recording paper by the use of the concealment sheet |
| 10/20/1993 | EP0565738A1 System for encoding and decoding data in machine readable graphic form |
| 10/19/1993 | US5255106 Method and apparatus for delivering secured hard-copy facsimile documents |
| 10/05/1993 | CA1322792C Method and apparatus for scrambling and unscrambling bar code symbols |
| 09/14/1993 | US5245655 Method and a device for the protected transmission of data |
| 09/07/1993 | US5243655 System for encoding and decoding data in machine readable graphic form |
| 08/24/1993 | US5239314 Thermally inprintable media incorporating non-reusable adhesive |
| 08/05/1993 | WO1993015491A1 Apparatus for scrambling and unscrambling documents |
| 08/03/1993 | US5233653 Apparatus and method for enciphered facsimile transmission and reception |
| 08/03/1993 | US5233436 Optical filter software copy protection |
| 07/27/1993 | US5231488 System for displaying and reading patterns displayed on a display unit |
| 07/20/1993 | CA1320581C Information transfer and use particularly with respect to objects such as gambling chips |
| 07/13/1993 | CA2046835A1 Graphic matter and process and apparatus for producing, transmitting and reading the same |
| 06/23/1993 | EP0547858A2 Data format for recording digital data and method |
| 06/02/1993 | EP0543893A1 System for the secure storage and transmission of data |
| 05/26/1993 | EP0506680A4 Optimal error-detecting and error-correcting code and apparatus |
| 05/25/1993 | US5214702 Public key/signature cryptosystem with enhanced digital signature certification |
| 05/25/1993 | US5214700 Method for obtaining a securitized cleartext attestation in a distributed data processing system environment |
| 05/19/1993 | EP0542703A1 A system for the safe transmission of messages |
| 05/18/1993 | US5212558 Secrecy-protected facsimile machine |
| 05/13/1993 | WO1993009525A1 Optical image encryption and decryption processes |
| 05/13/1993 | CA2122919A1 Optical image encryption and decryption processes |
| 05/08/1993 | CA2081155A1 System for the safe transmission of messages |
| 02/18/1993 | WO1993000668A3 Thermally-activated receiving media in a facsimile transmission system |
| 02/09/1993 | US5184849 Security system method and article for photocopiers and telefax machines |
| 01/21/1993 | WO1993001578A1 Ciphering device |
| 01/19/1993 | US5180153 Method and apparatus for maintaining confidential printed-sheet output |
| 01/07/1993 | WO1993000668A2 Thermally-activated receiving media in a facsimile transmission system |
| 12/23/1992 | EP0394426A4 Method and apparatus for scrambling and unscrambling bar code symbols |
| 11/26/1992 | WO1992020748A1 Invisible ink composition, invisible printed matter, and invisible printing application system |