If it refuses to grant the licence or to cause it to be granted, or if, within four months  of the date of the request, no information is forthcoming with regard to the granting of  the licence, the Commission shall have two months in which to bring the matter  before the Court of Justice.

The proprietor must be heard in the proceedings before the Court of Justice.

If the judgment of the Court of Justice establishes that the conditions of Article 17  have been complied with, the Member State concerned, or its appropriate  authorities, shall take such measures as enforcement of that judgment may require.

Article 22

1. If the proprietor of the patent, provisionally protected patent right or utility model  and the licensee fail to agree on the amount of compensation, the parties concerned  may conclude a special agreement to refer the matter to the Arbitration Committee.

By doing so, the parties waive the right to institute any proceedings other than those  provided for in Article 18.

2. If the licensee refuses to conclude a special agreement, the licence he has been  granted shall be deemed void.

If the proprietor refuses to conclude a special agreement, the compensation referred  to in this Article shall be determined by the appropriate national authorities.

Article 23

After the lapse of one year, the decisions of the Arbitration Committee or the  appropriate national authorities may, if there are new facts to justify it, be revised  with respect to the terms of the licence.

Such revision shall be a matter for the body which gave the decision.

Section 3

Security provisions

Article 24

Information which the Community acquires as a result of carrying out its research  programme, and the disclosure of which is liable to harm the defence interests of one  or more Member States, shall be subject to a security system in accordance with the  following provisions.

1. The Council shall, acting on a proposal from the Commission, adopt security  regulations which, account being taken of the provisions of this Article, lay down the various security gradings to be applied and the security measures

<12>