International Organisations Employees of international organizations that have access to classified information must be holder of a security clearance. Security Clearances Administrations wishing to access classified information must first be registered with the National Security Authority. The National Security Authority can only register administrations or international organisations that are based in Belgium and those to which Belgium is responsible by virtue of international treaties. Security Officer Besides clearing and vetting of individuals and organizations, the National Security Authority imposes additional measures to ensure the protection of classified information. Thus, any organization that handles classified information is required to appoint a Security Officer. Contracts, Visits and Transportations To protect the contents of classified contracts, in the negotiation or execution of which, contractors concerned must observe certain rules. These are always described in detail in the classified contract.