can i place adsense ads on pages that are password protected and available for premium users only ? if the answer is yes then how can google peoples reviews such kind of pages if they want to ?
As Google says in the AdSense Terms of Service, explaining why you might not be getting ads on a protected page: "Your web pages are behind a login: At this time, pages that require a login can not be easily visited by our crawlers. Additionally, since these types of pages are not easily visited for approval and it is difficult for our AdSense specialists to verify that pages behind a log in follow Google AdSense policies, we are unable to offer support for these pages." However, it is possible using a new feature called AdSense Site Authentication. Look into that.
Thank you instant87, that is good to know and this is actually good news for me because I am offering some stuff to premium users (behind login pages) which are NOT fully complies to the adsense TOS but in this case I should be fine as no one from google members can see those pages furthermore ads can not be shown on those pages anyway.