Where do programs store the check against Volume ID (HWID, Volume Serial, etc.)?

[DavidXanatos]

I find it strange that the trail period locally depends on the HWID.
I mean if I save a date some ware some how and than find it I use it.
I wouldn't assume any legit trail case where a customer would have a machine with the date set but a changed HWID.

Are you sure the tool is not communicating over the internet with its mothership and checking with them if for this machien with this HWID the trail period is not expired?