I’m not quite sure of the marketing angle here. I’ve seen power pole posters used to “buy a 4 bedroom homes with quick transaction!”, “lose 30kgs in 4 weeks”, and promote “swedish tribute band – BAABAA”.
But trying to flog Windows anti-virus software from the roadside is a first. Maybe they’re trying to home in on a niche customer base that I am not aware of. I have to admit that I dubious of the integrity of software that is bought from someone who advertises with hand-painted posters as if it is a garage sale. Maybe it is all legit, though I have my doubts when the recommended retail price at Symantec is $99.99 and this can be had for a bargain at $30. I imagine Symantec don’t normally offer such deep discounts to their resellers. (And I am also assuming that this guy isn’t just selling a one-off unwanted licence).
Disclaimer: I have not contacted the seller, hence I am only giving my opinion on this advertisement. If you do follow through and make a purchase from them, don’t hold me responsible as to the software’s efficacy or otherwise.