At that time, in 1981, DEC sponsored an annual conference for its product users, and one year I read that the conference was going to be held in L.A. A popular magazine for users of this operating system carried an announcement about a new security product, LOCK-11. The product was being promoted with a clever ad campaign that said something like, "It's 3:30 a.m. and Johnny down the street found your dial-in number, 555-0336, on his 336th try. He's in and you're out. Get LOCK-11." The product, the ad suggested, was hacker-proof. And it was going to be on display at the conference.