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Jon Elson

wrote:

Most of these programs err on the side of hysteria and paranoia - if
they didn't report anything, you might think you had wasted your money
on them...
The problem is to speed scanning, the size of the pattern to match against
is kept small. If there are now millions of morphed and altered virus
patterns known, eventually nearly every chunk of text or machine code
might start matching one of them.

Jon