17Where in the case of a dramatic or musical work made before 1st July 1912, the right conferred by the 1911 Act did not include the sole right to perform the work in public, the acts restricted by the copyright shall be treated as not including—
(a)performing the work in public,
(b)broadcasting the work or including it in a cable programme service, or
(c)doing any of the above in relation to an adaptation of the work;
and where the right conferred by the 1911 Act consisted only of the sole right to perform the work in public, the acts restricted by the copyright shall be treated as consisting only of those acts.