Well the client appears to be updated every couple of months, I would imagine the server gives the client a Time To Live and if it doesnt re-certify within that time or something close to it the game shuts down.
The servers couldn't handle constant polling there must be a pause a little like Windows checking for updates with Microsoft.
TBH I've not found the DRM to be much of a problem including the occasional disconnect from my ISP, though I do appreciate others have legitimate circustances where its totally unacceptable.
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