the problem with some of the suggestions made here, is that they relate to the results of the licence being withdrawn, and not to the withdrawal itself.
to disqualify: http://www.bartleby.com/61/39/D0283900.html
is what happens to me when my driver's licence is taken away from me: it is a result of the 'taking away'
is what happens to my right to drive (symbolised by my driving licence) when my driver's licence is taken away, and is, again, the result of the 'taking away' and not the 'taking away' itself.
my understanding of the German is that the police are empowered to withdraw a driver's licence if the driver commits a crime under law punishable by such a withdrawal - the consequence of the withdrawal is that the driver is no longer empowered by law to drive a vehicle, and, if the police can prove their case, the court will revoke the licence or disqualify the driver from driving.
the end result is that the Entzug spoken of in the original query is, imo, best matched by 'withdrawal', as being the technical term for the physical 'taking away' of a licence from a driver.