Law No. 412/2005 Coll., on the protection of classified information and security capability, shall lay down the conditions for the release of classified information in international relations. These can only be provided on the basis of a written request and permission from the NSA under the conditions laid down by law. State authorities, legal entities and natural persons engaged in business activities shall record, store or transmit classified information in the registers of classified information for the establishment of which they are designated as: § 79 Paragraph 3 of the Act entitles the NSA to apply. The request, signed by the responsible person, should be addressed to the Department of Administrative and Physical Security of the NSA, P.O. BOX 49, Prague 56, 150 06.

You can find a template for the application for the establishment of a register here.