Edinburgh Agreement (1992)

The Edinburgh Agreement or Edinburgh Decision is a December 1992 agreement reached at a European Council meeting in Edinburgh, Scotland, that granted Denmark four exceptions to the Maastricht Treaty so that it could be ratified by Denmark. This was necessary because, without all member states of the European Union ratifying it, it could not come into effect.

Source: Wikipedia — Edinburgh Agreement (1992) (CC BY-SA 4.0)