Michael wrote:
Well, "viral" is another expression for "spreading illness". This term only fits proprietary licenses which really infect the whole system built upon, making it non-free. The GPL (and other copleft licenses) can be described much better as "immunizing" against the illness of proprietary licenses. These terms were found by Bernhard Reiter, as far as I know.
from a programmers point of view, i'd call that inedible rather than viral :-)
i think we as the free software community could prove a good sense of humor by not completely smashing down the term with viruses like the one graham mentioned in mind or with respect to the importance of viruses to microbiology.
of course, all with a due sense of audience; talking to proprietary software people accusing (!) the gpl of being viral, i will probably find myself using other words to describe the benefits of copyleft licensing.
(sent that 2007-08-29, forgot to change email address; sorry michael for sending this twice)