The computer worm was invented by the sci-fi author John Brunner in his 1975 novel "The Shockwave Rider". The first real implementation of a computer worm was published by John Shoch and Jon Hupp of Xerox PARC in 1982 (CACM Vol 25 No 3). I wrote my first one in 1985 (on BNA) but I am quite sure that hundreds, perhaps thousands, of other people had written their own versions by then. Robert TAPPAN Morris only released his worm in 1988.
This is important because today we have the situation where large corporations are claiming patents on inventions that have been common knowledge for fifty years or more. We, the /. crowd, need to keep reminding people, especially the USPTO, of PRIOR ART. Otherwise the whole free/open software movement will be dead within a few years.