Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7978877 | Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program | Takao Nakamura, Hiroshi Ogawa, Atsuki Tomioka | 2011-07-12 |
| 7860270 | Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program | Takao Nakamura, Hiroshi Ogawa, Atsuki Tomioka | 2010-12-28 |
| 7817818 | Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program | Takao Nakamura, Hiroshi Ogawa, Atsuki Tomioka | 2010-10-19 |
| 7792323 | Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program | Takao Nakamura, Hiroshi Ogawa, Atsuki Tomioka | 2010-09-07 |
| 7640431 | Method and apparatus for digital watermarking | Hiroshi Ogawa, Takao Nakamura, Atsuki Tomioka | 2009-12-29 |
| 7187769 | Method and apparatus for evaluating the strength of an encryption | Shiho Moriai, Kazumaro Aoki, Masayuki Kanda, Kazuo Ohta | 2007-03-06 |
| 7164778 | Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program | Takao Nakamura, Hiroshi Ogawa, Atsuki Tomioka | 2007-01-16 |
| 7072492 | Method and apparatus for digital watermarking | Hiroshi Ogawa, Takao Nakamura, Atsuki Tomioka | 2006-07-04 |
| 6769063 | Data converter and recording medium on which program for executing data conversion is recorded | Masayuki Kanda, Kazumaro Aoki, Hiroki Ueda, Kazuo Ohta, Tsutomu Matsumoto | 2004-07-27 |
| 6704431 | Method and apparatus for digital watermarking | Hiroshi Ogawa, Takao Nakamura, Atsuki Tomioka | 2004-03-09 |
| 6044463 | Method and system for message delivery utilizing zero knowledge interactive proof protocol | Masayuki Kanda, Kiyoshi Yamanaka | 2000-03-28 |
| 6011848 | Method and system for message delivery utilizing zero knowledge interactive proof protocol | Masayuki Kanda, Kiyoshi Yamanaka | 2000-01-04 |
| 5701343 | Method and system for digital information protection | Shinji Ishii, Kiyoshi Yamanaka | 1997-12-23 |