Privacy using Secure DNS service?

I’d like to know what data Comodo stores from users of the free Secure DNS service, and how long they store it. I found a general privacy policy for the Comodo website, but it doesn’t clearly tell me what I want to know specifically about data collected while using their DNS service.

For comparison, Google has a privacy policy specifically for their public DNS service which says, among other things, “The temporary logs store the full IP address of the machine you’re using. . . We delete these temporary logs within 24 to 48 hours.”

How does Comodo’s policy for its DNS service compare regarding storing of IP addresses collected while people use their free Secure DNS service?