A reversion of rights might, therefore, occur under section 203 as well as under the renewal provisions of the 1909 Act with respect to some works. Works originally protected under the 1909 Act will be subject to section 203 with respect to grants executed after January 1, 1978 and subject to termination under the 1909 Act's renewal provisions if in their first term of copyright on January 1, 1978. The section 203 right of termination may be exercised at any time during a five year period, beginning at the end of thirty-five years from the date of execution of the grant.5 7 Termination may be exercised by the author, if living, or by enumerated statutory successors, if the author is dead. Special provisions are set out for effecting termination of joint works.