Speaking at a MIX10 session about Windows Phone 7 Series architecture this morning, Microsoft's Istvan Cseri mentioned that the Windows Phone Marketplace -- the one and only clearinghouse for apps in WP7S -- will be able to remotely revoke licenses. Since devices will only run properly-licensed apps, this effectively means the company will be able to shut down apps remotely -- a capability they'd probably invoke if a Marketplace app were to badly misbehave en masse, for example. To put it bluntly, Cseri says that apps simply aren't in control of their own life cycle; the user controls installation and removal while the Marketplace ensures that the license is valid.

On a related note, we know that Microsoft has a series of not-yet-finalized "business, technical, and content" guidelines for accepting and rejecting apps submitted to the Marketplace, and we've got a particularly interesting case: apps are being "discouraged" from using the phone's Back button. They're being so strongly discouraged, in fact, that Todd Brix -- senior director of mobile platform services product management at the company -- told us that apps can and will be straight-up rejected for using Back for anything but dismissing dialog boxes. We won't know the full rulebook until Microsoft releases it in May -- but in the meantime, don't bother making anything too controversial with those free tools, eh?

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Windows Phone Marketplace can remotely revoke app licenses