How I can be sure that your version is not pirated? I've seen plenty of this licenses, keys and activators on torrent sites.
They are usually working fine and without problems but they are illegal. Is there a proof that your version is legit?
Sorry, I don't know how to proof it. Also I don't think that you can share licenses therefore it's unlikely that you'll find a working key for free.
But yes you could probably use an activator or cracker to use the software for free. (illegal)
Only way to prove keys are legit is by going to their site and using the keys on site and testing etc. Most pirated keys get black listed very quickly and even using cracks to trick the server. Even the updates service will get blocked as they have an authentication server that checks the serial and key each time it checks for updates and new virus databases. Even getting around one works then you get to the 2nd part and blocks updates. Their ways around it but pirated versions of Kaspersky now are almost impossible to keep running and continue use. Licences you can use on multi-machine as you can buy 1 3 5 and 10 device keys. Cost a little more but can use on x amount, providing you buy that type of licence..
With the keys you provide are you a re-seller distributor with access to them? or are they keys bought etc and then sold on like a re distribution service provider etc?
I am not an official reseller and I don't have unlimited supply of these licenses.