I run a website where I have 3 AdSense units and 2 ad units from another ad network.
The OTHER ad network sent me an DFP AdExchange invitation, saying that by signing up, they would be able to send more ads to my ad units and increase my revenue.
The invitation url looks like this
https://www.google.com/adxseller/participant-registration?invitation=[LONG CODE]
Is it okay to sign up for AdExchange when I am already using AdSense on my site. Is there any official statement from Google about its policies on this topic ?
I did come across this doc which explains how AdExchange works.