do you think placing bidvertiser ads in your site/blog violates adsense rules?

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before i place bidvertiser ads and even adbrite ads in my blog, along with google adsense ads. but i removed bidvertiser and adbrite ads as i think it violates google adsense rules, coz bidvertiser and adbrite likely using contextual ads, same method with adsense. do you have any experiences regarding this? pls share it here. thx in advance for your contribution