In the case of a work of joint authorship, copyright shall subsist during the life of the author who first dies and for a term of fifty years after his death, or during the life of the author who dies last, whichever period is the longer, and references in this Act to the period after the expiration of any specified number of years from the death of the author shall be construed as references to the period after the expiration of the like number of years from the death of the author who dies first or after the death of the author who dies last, whichever period may be the shorter, and in the provisions of this Act with respect to the grant of compulsory licences a reference to the date of the death of the author who dies last shall be substituted for the reference to the date of the death of the author.

Where, in the case of a work of joint authorship, some one or more of the joint authors do not satisfy the conditions conferring copyright laid down by this Act, the work shall be treated for the purposes of this Act as if the other author or authors had been the sole author or authors thereof :

Provided that the term of the copyright shall be the same as it would have been if all the authors had satisfied such conditions as aforesaid.

For the purposes of this Act, " a work of joint authorship " means a work produced by the collaboration of two or more authors in which the contribution of one author is not distinct from the contribution of the other author or authors.

Where a married woman and her husband are joint authors of a work the interest of such married woman therein shall be her separate property.

In the case of a literary dramatic or musical work, or an engraving, in which copyright subsists at the date of the death of the author or, in the case of a work of joint authorship, at or immediately before the date of the death of the author who dies last, but which has not been published, nor, in the case of a dramatic or musical work, been performed in public, nor, in the case of a lecture, been delivered in public, before that date, copyright shall subsist till publication, or performance or delivery in public, whichever may first happen, and for a term of fifty years thereafter, and the proviso to section three of this Act shall, in the case of such a work, apply as if the author had died at the date of such publication or performance or delivery in public as aforesaid.

The ownership of an author's manuscript after his death, where such ownership has been acquired under a testamentary disposition made by the author and the manuscript is of a work which has not been published nor performed in public nor delivered in public, shall be prima facie proof of the copyright being with the owner of the manuscript.

Copyright shall subsist in records, perforated rolls, and other contrivances by means of which sounds may be mechanically reproduced, in like manner as if such contrivances were musical works, but the term of copyright shah be fifty years from the making of the original plate from which the contrivance was directly or indirectly derived, and the person who was the owner of such original plate at the time when such plate was made shall be deemed to be the author of the work, and, where such owner is a body corporate, the body corporate shall be deemed for the purposes of this Act to reside within the parts of His Majesty's dominions to which this Act extends if it has established a place of business within such parts.

If any such contrivance is made reproducing two or more different works in which copyright subsists and the owners of the copyright therein are different persons, the sums payable by way of royalties under this section shall be apportioned amongst the several owners of the copyright in such proportions as, failing agreement, may be determined by arbitration.

When any such contrivances by means of which a musical work may be mechanically performed have been made, then, for the purposes of this section, the owner of the copyright in the work shall, in relation to any person who makes the prescribed inquiries, be deemed to have given his consent to the making of such contrivances if he fails to reply to such inquiries within the prescribed time.

For the purposes of this section, the Board of Trade may make regulations prescribing anything which under this section is to be prescribed, and prescribing the mode in which notices are to be given and the particulars to be given in such notices, and the mode, time, and frequency of the payment of royalties, and any such regulations may, if the Board think fit, include regulations requiring payment in advance or otherwise securing the payment of royalties.

This Act shall not apply to designs capable of being registered under the Patents and Designs Act, 1907, except designs which, though capable of being so registered, are not used or intended to be used as models or patterns to be multiplied by any industrial process.

General rules under section eighty-six of the Patents and Designs Act, 1907. may be made for determining the conditions under which a design shall be deemed to be used for such purposes as aforesaid.

For the purposes of this section, the expression "author" includes the legal personal representatives of a deceased author.

Subject to the provisions of section nineteen subsections (7) and (8) and of section thirty-three of this Act, copyright shall not subsist in any work made before the commencement of this Act, otherwise than under, and in accordance with, the provisions of this section.