Brawn chief executive Nick Fry said they would view any such activities “very dimly”, while also hinting he felt Button, who sealed his move to McLaren earlier this week, had been disloyal.
“Jenson will not be doing anything at all for McLaren until the end of this calendar year,” said Fry in The Guardian. “And if he does, we will be looking on it very dimly.
“He didn’t have any obligations to us in 2010, but there are issues with regard to the [McLaren contract] signing process on which we are in discussion with him at the moment.
“There are other constraints on what Jenson can do between now and the end of the year which we will be rigorously enforcing.”
The stance, which will apply to activities both on and off the track, is unusual among Formula One teams, who generally allow departing drivers to join up with their new team after the final race of the season.