The legal basis for the central historical archives is the decision by the Bureau of the European Parliament of 16 December 2002 entitled 'Towards improved information and greater transparency: the archives of the European Parliament'.
This decision sets out a number of measures seeking to ensure greater transparency in the process of making EP historical documentation available to the public. To this end, it establishes the principle that EP historical documents should be centralised.
Two regulations govern the principle of transparency with regard to documentation, by allowing the public to have access to documents, and the protection of personal data.