From: utzoo!decvax!harpo!seismo!rlgvax!guy
Newsgroups: net.unix-wizards
Title: Re: Set UID patent number? - (nf)
Article-I.D.: rlgvax.240
Posted: Tue Apr 12 13:44:49 1983
Received: Wed Apr 13 04:21:51 1983
References: ima.315

United States Patent 4,135,240, Jan. 16, 1979

PROTECTION OF DATA FILE CONTENTS

Inventor: Dennis M. Ritchie, Summit, N.J.

With a big hardware block diagram and an explanation in terms of signals,
gates, etc. for something that exists only in sys1.c etc.