Nothing contained in this chapter shall be held to make unlawful any of the following acts:

(a) Repealed. Aug. 8, 1946, ch. 910, §13, 60 Stat. 944.

(b) Any citizen of the United States, or any corporation organized within the United States, may, when duly authorized by the President, pay to an enemy or ally of enemy any tax, annuity, or fee which may be required by the laws of such enemy or ally of enemy nation in relation to patents and trade-marks, prints, labels, and copyrights; and any such citizen or corporation may file and prosecute an application for letters patent or for registration of trade-mark, print, label, or copyright in the country of an enemy, or of an ally of enemy after first submitting such application to the President and receiving license so to file and prosecute, and to pay the fees required by law and customary agents' fees, the maximum amount of which in each case shall be subject to the control of the President.

(c) Any citizen of the United States or any corporation organized within the United States desiring to manufacture, or cause to be manufactured, a machine, manufacture, composition of matter, or design, or to carry on, or to use any trade-mark, print, label or cause to be carried on, a process under any patent or copyrighted matter owned or controlled by an enemy or ally of enemy at any time during the existence of a state of war may apply to the President for a license; and the President is authorized to grant such a license, nonexclusive or exclusive as he shall deem best, provided he shall be of the opinion that such grant is for the public welfare, and that the applicant is able and intends in good faith to manufacture, or cause to be manufactured, the machine, manufacture, composition of matter, or design, or to carry on, or cause to be carried on, the process or to use the trade-mark, print, label or copyrighted matter. The President may prescribe the conditions of this license, including the fixing of prices of articles and products necessary to the health of the military and naval forces of the United States or the successful prosecution of the war, and the rules and regulations under which such license may be granted and the fee which shall be charged therefor, not exceeding $100, and not exceeding one per centum of the fund deposited as hereinafter provided. Such license shall be a complete defense to any suit at law or in equity instituted by the enemy or ally of enemy owners of the letters patent, trade-mark, print, label or copyright, or otherwise, against the licensee for infringement or for damages, royalty, or other money award on account of anything done by the licensee under such license, except as provided in subsection (f) hereof.

(d) The licensee shall file with the President a full statement of the extent of the use and enjoyment of the license, and of the prices received in such form and at such stated periods (at least annually) as the President may prescribe; and the licensee shall pay at such times as may be required to the alien property custodian not to exceed five per centum of the gross sums received by the licensee from the sale of said inventions or use of the trade-mark, print, label or copyrighted matter, or, if the President shall so order, five per centum of the value of the use of such inventions, trade-marks, prints, labels or copyrighted matter to the licensee as established by the President; and sums so paid shall be deposited by said alien property custodian forthwith in the Treasury of the United States as a trust fund for the said licensee and for the owner of the said patent, trade-mark, print, label or copyright registration as hereinafter provided, to be paid from the Treasury upon order of the court, as provided in subsection (f) of this section, or upon the direction of the alien property custodian.

(e) Unless surrendered or terminated as provided in this chapter, any license granted hereunder shall continue during the term fixed in the license or in the absence of any such limitation during the term of the patent, trade-mark, print, label, or copyright registration under which it is granted. Upon violation by the licensee of any of the provisions of this chapter, or of the conditions of the license, the President may, after due notice and hearing, cancel any license granted by him.

(f) The owner of any patent, trade-mark, print, label, or copyright under which a license is granted hereunder may, after the end of the war and until the expiration of one year thereafter, file a bill in equity against the licensee in the district court of the United States for the district in which the said licensee resides, or, if a corporation, in which it has its principal place of business (to which suit the Treasurer of the United States shall be made a party), for recovery from the said licensee for all use and enjoyment of the said patented invention, trade-mark, print, label, or copyrighted matter: Provided, however, That whenever suit is brought, as above, notice shall be filed with the alien property custodian within thirty days after date of entry of suit: Provided further, That the licensee may make any and all defenses which would be available were no license granted. The court on due proceedings had may adjudge and decree to the said owner payment of a reasonable royalty. The amount of said judgment and decree, when final, shall be paid on order of the court to the owner of the patent from the fund deposited by the licensee, so far as such deposit will satisfy said judgment and decree; and the said payment shall be in full or partial satisfaction of said judgment and decree, as the facts may appear; and if, after payment of all such judgments and decrees, there shall remain any balance of said deposit, such balance shall be repaid to the licensee on order of the alien property custodian. If no suit is brought within one year after the end of the war, or no notice is filed as above required, then the licensee shall not be liable to make any further deposits, and all funds deposited by him shall be repaid to him on order of the alien property custodian. Upon entry of suit and notice filed as above required, or upon repayment of funds as above provided, the liability of the licensee to make further reports to the President shall cease.

If suit is brought as above provided, the court may, at any time, terminate the license, and may, in such event, issue an injunction to restrain the licensee from infringement thereafter, or the court, in case the licensee, prior to suit, shall have made investment of capital based on possession of the license, may continue the license for such period and upon such terms and with such royalties as it shall find to be just and reasonable.

In the case of any such patent, trade-mark, print, label, or copyright, conveyed, assigned, transferred, or delivered to the Alien Property Custodian or seized by him, any suit brought under this subsection, within the time limited therein, shall be considered as having been brought by the owner within the meaning of this subsection, in so far as such suit relates to royalties for the period prior to the sale by the Alien Property Custodian of such patent, trade-mark, print, label, or copyright, if brought either by the Alien Property Custodian or by the person who was the owner thereof immediately prior to the date such patent, trade-mark, print, label, or copyright was seized or otherwise acquired by the Alien Property Custodian.

(g) Any enemy, or ally of enemy, may institute and prosecute suits in equity against any person other than a licensee under this chapter to enjoin infringement of letters patent, trade-mark, print, label, and copyrights in the United States owned or controlled by said enemy or ally of enemy, in the same manner and to the extent that he would be entitled so to do if the United States was not at war: Provided, That no final judgment or decree shall be entered in favor of such enemy or ally of enemy by any court except after thirty days' notice to the alien property custodian. Such notice shall be in writing and shall be served in the same manner as civil process of Federal courts.

(h) All powers of attorney heretofore or hereafter granted by an enemy or ally of enemy to any person within the United States, in so far as they may be requisite to the performance of acts authorized in subsections (a) and (g) of this section, shall be valid.

(i) Whenever the publication of an invention by the granting of a patent may, in the opinion of the President, be detrimental to the public safety or defense, or may assist the enemy or endanger the successful prosecution of the war, he may order that the invention be kept secret and withhold the grant of a patent until the end of the war: Provided, That the invention disclosed in the application for said patent may be held abandoned upon it being established before or by the Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office that, in violation of said order, said invention has been published or that an application for a patent therefor has been filed in any other country, by the inventor or his assigns or legal representatives, without the consent or approval of the commissioner or under a license of the President.

When an applicant whose patent is withheld as herein provided and who faithfully obeys the order of the President above referred to shall tender his invention to the Government of the United States for its use, he shall, if he ultimately receives a patent, have the right to sue for compensation in the United States Court of Federal Claims, such right to compensation to begin from the date of the use of the invention by the Government.