On 10 September 2008, the European Commission opened an in-depth investigation into two public service contracts between the Danish Transport Ministry and the rail company Dansk Statsbaner (DSB). The contracts cover passenger rail services for 2000-2004 and 2005-2014. The aim of the investigation is to determine whether the amounts paid by the government were limited to covering the costs of meeting the contract obligations. The obligations include the terms of the destinations served, the frequency of the services and the quality of the rail services. If DSB has been over-compensated, this will constitute State aid, which may have to be recovered if it cannot be otherwise justified within the State aid rules.