| 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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| 01/26/1999 | US5864622 Secure identification card and method and apparatus for producing and authenticating same |
| 01/20/1999 | CN1205496A Laser holographic position value numeral mark |
| 01/19/1999 | US5861619 Method of coding an electronic text document |
| 01/14/1999 | WO1999001815A1 Obfuscation techniques for enhancing software security |
| 01/13/1999 | EP0891071A2 Apparatus and method for watermark data insertion and apparatus and method for watermark data detection |
| 01/12/1999 | US5858586 Digital information recording media and method of using same |
| 01/07/1999 | EP0717896B1 System and method for key distribution using quantum cryptography |
| 12/23/1998 | EP0885416A1 Encoding technique for software and hardware |
| 12/16/1998 | EP0884669A2 Digital copyright management system using electronic watermark |
| 12/15/1998 | US5850481 Steganographic system |
| 12/15/1998 | US5850441 System and method for key distribution using quantum cryptography |
| 12/02/1998 | EP0880840A1 System for controlling access and distribution of digital property |
| 11/26/1998 | WO1998053565A1 Apparatus and method for embedding and extracting information in analog signals using distributed signal features |
| 11/26/1998 | CA2288213A1 Apparatus and method for embedding and extracting information in analog signals using distributed signal features |
| 11/25/1998 | EP0880134A2 Information adding/extracting method, information adding/extracting system, information signal processor and information signal recording medium |
| 11/25/1998 | EP0879535A1 Method of marking binary-coded data sets |
| 11/25/1998 | EP0717895B1 Key distribution in a multiple access network using quantum cryptography |
| 11/22/1998 | CA2237975A1 Information adding/extracting method, information adding/extracting system, information signal processor and information signal recording medium |
| 11/18/1998 | EP0877998A1 Digital anti-counterfeiting software method and apparatus |
| 11/18/1998 | CN1040804C Fiber optic barcode readers |
| 11/17/1998 | US5838791 Encoder and decoder |
| 11/12/1998 | WO1998033324A3 Embedding supplemental data in an encoded signal |
| 11/04/1998 | CN1198284A Data hiding method and data extracting method |
| 10/28/1998 | CN1197244A Data hiding method and data extraction method using statistical examination |
| 10/28/1998 | CN1197243A Data hiding method and system using statistical properties |
| 10/27/1998 | CA2109554C Secure document and method and apparatus for producing and authenticating same |
| 10/27/1998 | CA2109553C Secure identification card and method and apparatus for producing and authenticating same |
| 10/20/1998 | US5825892 Protecting images with an image watermark |
| 10/14/1998 | EP0870272A1 Reader using moving averages to break the (n,k) code barrier for upc, ean, and others |
| 10/08/1998 | WO1998020672A3 Method and apparatus for imprinting id information into a digital content and for reading out the same |
| 10/07/1998 | CN1195321A Security protection double paper for facsimile reception |
| 09/29/1998 | CA2048535C Security system for electronic printing systems |
| 09/22/1998 | US5812661 Software reproduction apparatus |
| 09/16/1998 | EP0864959A2 Data management system |
| 09/15/1998 | US5809160 Method for encoding auxiliary data within a source signal |
| 09/15/1998 | US5808287 Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols |
| 09/09/1998 | CN1192814A Protection of softward against use without permit |
| 08/26/1998 | EP0860793A2 A video-data encoder and recording media wherein a video encode program is recorded |
| 08/26/1998 | CN1191356A Data hiding method and data extracting method |
| 07/30/1998 | WO1998033324A2 Embedding supplemental data in an encoded signal |
| 07/29/1998 | EP0855052A1 Protection of software against use without permit |
| 07/29/1998 | CN1189042A Digital watermarking |
| 07/16/1998 | WO1998031123A1 Method and apparatus for authenticating magnetic media |
| 07/15/1998 | EP0853294A2 Method and system for producing and verifying watermarks |
| 07/08/1998 | EP0852441A1 Data hiding method and data extracting method |
| 07/08/1998 | EP0611470B1 Optical image encryption and decryption processes |
| 07/01/1998 | EP0851392A2 Data hiding and extraction method |
| 07/01/1998 | EP0851391A2 Data hiding and extracting method and system |
| 06/30/1998 | US5773182 Method of light stabilizing a colorant |
| 06/16/1998 | US5768378 Key distribution in a multiple access network using quantum cryptography |
| 06/10/1998 | EP0846146A1 Novel colorants and colorant modifiers |
| 06/09/1998 | US5764765 Method of communication |
| 06/03/1998 | EP0845757A2 Data hiding method and data extracting method |
| 06/03/1998 | CN1183693A Protecting images with image watermark |
| 05/26/1998 | US5757912 System and method for quantum cryptography |
| 05/20/1998 | EP0843237A2 Image processing apparatus, image processing method and storage medium |
| 05/14/1998 | WO1998020672A2 Method and apparatus for imprinting id information into a digital content and for reading out the same |
| 05/14/1998 | CA2271106A1 Method and apparatus for imprinting id information into a digital content and for reading out the same |
| 05/06/1998 | EP0840513A2 Digital data watermarking |
| 05/05/1998 | US5748763 Image steganography system featuring perceptually adaptive and globally scalable signal embedding |
| 04/29/1998 | EP0838785A2 Protecting images with an image watermark |
| 04/14/1998 | US5740276 Holographic method for encrypting and decrypting information using a fingerprint |
| 03/31/1998 | US5733693 Method for improving the readability of data processing forms |
| 03/25/1998 | EP0830676A1 Digital information recording media and method of using same |
| 03/25/1998 | EP0830256A2 Temporary marking, ultraviolet radiation detection, and printing, all using photoerasable colorants |
| 03/18/1998 | EP0829151A1 Method of encoding sequences consisting of figure-coded data units |
| 02/24/1998 | US5721788 Method and system for digital image signatures |
| 02/24/1998 | US5721287 Radiating in presence of transorber |
| 02/18/1998 | CN1173957A Marking a video and/or audio signal |
| 02/12/1998 | WO1998006195A1 Method and apparatus for echo data hiding in audio signals |
| 02/11/1998 | CN1037378C Record with removable two-dimensional code |
| 02/03/1998 | US5715316 Optical image encryption and decryption processes |
| 01/28/1998 | EP0821516A2 Communication terminal device |
| 01/28/1998 | CN1171692A Communication terminal device |
| 01/22/1998 | WO1998003014A1 Detecting a watermark embedded in an information signal |
| 01/21/1998 | EP0717897B1 System and method for quantum cryptography |
| 01/20/1998 | US5710419 Printing system |
| 01/14/1998 | EP0818724A1 Security system for electronic printing systems |
| 01/13/1998 | US5708717 Digital anti-counterfeiting software method and apparatus |
| 01/07/1998 | EP0265497B1 Information transfer and use, particularly with respect to objects such as gambling chips |
| 12/29/1997 | EP0813788A1 Method of and apparatus for manipulating digital data works |
| 12/29/1997 | EP0506680B1 Optimal error-detecting and error-correcting code and apparatus |
| 12/24/1997 | WO1997049235A1 Data hiding method and data extracting method |
| 12/24/1997 | CA2230071A1 Data hiding and extraction methods |
| 12/23/1997 | US5700850 Photostability; colorant and radiation absorber |
| 11/26/1997 | EP0808541A1 Marking a video and/or audio signal |
| 11/25/1997 | US5692048 Method and apparatus for sending secure facsimile transmissions and certified facsimile transmissions |
| 11/19/1997 | EP0807294A1 Photo-erasable data processing forms |
| 11/06/1997 | DE19622364C1 Graphic imaging method for pictures or text |
| 11/05/1997 | EP0804511A1 Novel colorants and colorant modifiers |
| 11/04/1997 | US5684885 Binary glyph codes based on color relationships |
| 11/04/1997 | US5683843 Solid colored composition mutable by ultraviolet radiation |
| 10/28/1997 | US5681380 Ink for ink jet printers |
| 10/08/1997 | EP0799246A1 Improved mutable composition |
| 10/07/1997 | US5675137 Bar code decoding using moving averages to break the (n,k) code barrier for UPC, EAN Code 128 and others |
| 09/23/1997 | US5671282 Method and apparatus for document verification and tracking |
| 09/16/1997 | US5668881 Encryption of data in different formats |
| 09/12/1997 | WO1997033216A1 Encoding technique for software and hardware |
| 09/03/1997 | EP0792553A1 Method for certifying a copy of a document such as a fax |
| 08/19/1997 | US5659167 Visually interactive decoding of dataforms |