alanrf
5
If you gave away a free product you might want to know if it was worth the effort to do so.
Does anyone use it? If they did use it sometime do they still do so?
In return for providing you a free product and continuing free anti-virus updates avast asks that once every (slightly more than a) year that you re-register for the updates so that they can have some idea how many folks are continuing to use the free product.
I suggest this very slight imposition compare favorably to the annual update tributes demanded by some other anti-virus products.