Microsoft won’t publish any downloadable titles on Xbox LIVE that first have a window of exclusivity on the PlayStation Network, reports Eurogamer.

Additionally, the platform-holder demands that all games ship with exactly the same content “on-disc” as its rival.

European Xbox boss Chris Lewis told the site, “We're a little biased, so obviously we're going to look to protect our own space as best we can and get exclusivity.”

“Whilst I can't be specific about the terms and conditions, you can be very confident we seek to maximise our own advantage to ensure the playing field is even, and certainly plays to our advantage wherever possible.”

“As you can also imagine, our partners have to be mindful of the relationship they have with all platform holders, and they need to be equitable,” he continued. “But there are contractual situations where we get agreement with different people to do different things, and through what we have available on Xbox LIVE, we are able to offer things other people can't offer, that allows that exclusivity and unique elements to it that might not otherwise be available elsewhere.”

According to Eurogamer, Microsoft’s third-party publisher guidelines read, “Titles for Xbox 360 must ship at least simultaneously with other video game platform, and must have at least feature and content parity on-disc with the other video game platform versions in all regions where the title is available.”

“If these conditions are not met, Microsoft reserves the right to not allow the content to be released on Xbox 360.”

Sony appears to have no such policy, a fact evidenced by the recent arrival of former Xbox LIVE-exclusive Limbo on the PlayStation Network amongst others.