Google Voice stores, processes and maintains your call history, voicemail greeting(s), voicemail messages, Short Message Service (SMS) messages, recorded conversations, and other data related to your account in order to provide the service to you.
There is no positive or negative statement about calls I do not intentionally record. Is google recording them and doing some kind of targeted advertising based on the content -- like it does with gmail? Or would this be so illegal that I have nothing to worry about?
I'm trying to find documentation saying that google voice does not try to parse and decode every voice call. I know I'm just taking their word for it, but its better than nothing.