Most Google Adsense users might have received this email about Google Adsense to have third party ads.
Here is a snippet from their email
Here is a snippet from their email
"We're happy to announce that the Google content network nowaccepts display ads served from qualified third-party vendors.During this initial release, only ads in English are eligible,although we look forward to offering more options in the future.
By accepting third-party ads, we can attract a greater variety ofadvertising on the Google content network, which we believe will result over time in increased revenue for publishers and more relevant advertising for end users."