Tobias, the person that knocked up FreeMarketplace, the Windows phone 7 DRM stripper, has now also provided developers with somewhat of a solution to the easy, automatic pirating of their apps.
He suggests developers include in their code a check for WMAppPRHeader.xml, a file which apparently only gets placed on the device when an app is installed properly from Marketplace, rather than being side-loaded on developer-unlocked devices.
Such a check can of course be worked around on an app by app basis, but should prevent the easy, automatic pirating of Windows Phone 7 apps.
Of course this will do nothing for the 5000 apps out there, but hopefully Microsoft will provide a more sophisticated solution soon.
Read more at NextbestGeek here.