The Royal Decree has been underway for years, but will come into force tomorrow when it is being published in the state's official gazette 'het Staatsblad'. It has been signed by Justice Minister Koen Geens (Flemish Christian democrat, responsible for the State Intelligence department) and Defence Minister Steven Vandeput (Flemish nationalist, responsible for the military security service).
Personal data about people can only be kept for longer than 50 years in "very exceptional cases". Even then, an evaluation will follow every 5 years to decide whether the data are still useful.
One person will have the task to do the follow-up and to see whether data are actually being erased, the so-called "counsellor for the protection of the private atmosphere."