Title	Patent No.	Country	Date
1	Cryptosystem for Encrypting Digital Image or Voice File	6023511	U.S.A.	2000.2.8
2	An Encryption Device for Digital Image and Voice Files	103202	R.O.C.	1999.5.11
3	A Method for Sharing Color Confidential Images	129581	R.O.C.	2001.3.1
4	A Robust Digital Watermark Method for Multimedia	140692	R.O.C.	2001.8.21
5	A Secure Protocol for End-to-End Mobile Users with Double Authentication	140313	R.O.C.	2001.7.31
6	Feature-Oriented Digital Watermark for Multimedia	140057	R.O.C.	2001.8.1
7	A Speech Hiding Method Based upon Sub-band Coding	141279	R.O.C.	2001.9.1
8	A Digital Watermark Method Based on Neural Networks	145485	R.O.C.	2001.10.21
9	A Robust Method of Gray-Scale Watermark Embedding and Retrieval	178825	R.O.C.	2003.05.11
10	A Progressive Image Transmission Method Based on Guessing Neighbors	199178	R.O.C.	2004.07.22
11	A Irregular Sampling Coding Method Suitable for Image Authentication and Recoverable Tamper Proofing	I248037	R.O.C	2006.1.21
12	A Watermarking Technique Based on Side-Match VQ Coding Method	Under examining	R.O.C.
13	Sharing Visual Secrets Using Adapting Circle Shares	Under examining	R.O.C.