How Can I Check If My License Keys Are Valid?

I recently purchased 2 copies of BitDefender Internet Security 2014 (key only, 3 PCs 2 Years) from a eBay seller. The seller stated on his auction page that the keys were never registered and the items are brand new.


How can I check if my keys are valid and never been used? ***without start the countdown


Kind regards


Karoon

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