Inventor
UMEKI HISASHI
JP4 patents
⚠️ This page may combine multiple inventors who share the name “UMEKI HISASHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
3 patentsUS6189032B1Feb 13, 2001
Client-server system for controlling access rights to certain services by a user of a client terminal
HITACHI LTD143 citations97
US6041408AMar 21, 2000
Key distribution method and system in secure broadcast communication
HITACHI LTD46 citations94
US6512829B1Jan 28, 2003
Key distribution method and system in secure broadcast communication
HITACHI LTD8 citations72