Inventor
CHOI JONG-UK
KR20 patents
⚠️ This page may combine multiple inventors who share the name “CHOI JONG-UK”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MARKANY INC
17 patentsUS7447329B2Nov 4, 2008
Apparatus and method for producing a document verifiable for its forgery or alteration, and apparatus and method for authenticating the document
MARKANY INC30 citations92
US7280669B2Oct 9, 2007
Digital image watermarking apparatus and method
MARKANY INC21 citations92
US6839673B1Jan 4, 2005
Digital watermarking method and apparatus for audio data
MARKANY INC109 citations92
US7140043B2Nov 21, 2006
Watermark embedding and detecting method by quantization of a characteristic value of a signal
MARKANY INC32 citations90
US6975733B1Dec 13, 2005
Watermarking of digital images using wavelet and discrete cosine transforms
MARKANY INC39 citations89
US7594274B2Sep 22, 2009
Method of authenticating an application for personal digital assistant using a unique ID based on a personal computer and system using thereof
MARKANY INC21 citations88
US7457957B2Nov 25, 2008
Apparatus and method for issuing and authenticating securities, etc. using digital watermarking
MARKANY INC10 citations84
US6940995B2Sep 6, 2005
Method for embedding and extracting text into/from electronic documents
MARKANY INC17 citations77
US9742783B2Aug 22, 2017
Method for sending contents including tracking information and apparatus thereof, and method for receiving content including tracking information and apparatus thereof
MARKANY INC4 citations73
US7386729B2Jun 10, 2008
Method of inserting/detecting digital watermark and apparatus for using thereof
MARKANY INC8 citations73
US9830433B2Nov 28, 2017
Method, system and device for enhancing business information security
MARKANY INC2 citations64
US9819494B2Nov 14, 2017
Digital signature service system based on hash function and method thereof
MARKANY INC3 citations64
US11469879B2Oct 11, 2022
Text watermarking method and apparatus for hiding information into text documents
MARKANY INC0 citations62
US9491147B2Nov 8, 2016
DRM content stream transmission apparatus, method, and transmission and reception system
MARKANY INC2 citations58
US7395432B2Jul 1, 2008
Method of embedding/detecting digital watermark and apparatus for using thereof
MARKANY INC1 citations52
US11669500B2Jun 6, 2023
System and method for distributing data using block chain
MARKANY INC0 citations40
US9818233B2Nov 14, 2017
Method and apparatus for automatically splitting object and method, apparatus, and system for registering file
MARKANY INC0 citations36