"As president of Zero-Knowledge Systems, which builds privacy software, Mr. Hill has spoken at conferences around North America, espousing the credo that a person's online movements are no one else's business. ... Many companies have also published the code that . . .
"As president of Zero-Knowledge Systems, which builds privacy software, Mr. Hill has spoken at conferences around North America, espousing the credo that a person's online movements are no one else's business. ... Many companies have also published the code that lies behind their programs -- open-source code -- so that the programming can be reviewed by other technical experts. Among those that have open-source philosophies are Hush Communications, Zero-Knowledge, PrivacyX and Network Associates, which now owns the P.G.P. software."