Neither; we used to use Kaspersky for about a year but we stopped using that at v3.0, we found that any object-code (i.e. non-modifiable) engine didn't allow us to develop and optimize the product as we wanted so we decided to bring the engine development in-house.
So as of v3.0, including that latest version v3.1, it's using the PC Tools AntiVirus Engine which is based on another long-standing engine but is now separately developed by PC Tools. It has just passed WestCoast Labs AntiVirus certification in its own right, and we are waiting on the finalization of ICSA certification as well.
The good thing about this is we are currently working on lots of features and improvements to the engine (and product) something that we couldn't do before when we used a binary licensed engine.
Simon
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