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Is it acceptable to place either a script with the code of several publishers in rotation, or to place several ad units on one page with the code of several publishers, i.e. One page, four ad units, each owned by a different publisher?
IMHO though, lets say even if it is allowed. Say person A gets a lot of clicks on his ads and person B hardly gets any. Person B is probably going to be upset. Why not just use one publishers id and split it evenly 4 ways. That is if you trust each other.
Either way, to verify I would ask G first.
Just my 2 cents.
One site even does this to allow active forum members with their own adsense accounts to collect a portion of the forum ad revenue pages they contribute to.(HINT, webmasterworld, HINT)
The idea is that they'll use your Google adsense ID some of the time instead of their own when they serve that page. Sorta changes things, don't it?