Generally, under 17 U.S.C.A. § 304(a), a copyright the first term of which is subsisting on January 1, 1978 may be renewed for 67 years. Further, 17 U.S.C.A. § 304(c) provides that the grant or transfer of the renewal copyright, or any right under it, executed before January 1, 1978, by an individual author or the author's surviving spouse, surviving children, executor, or next of kin may be terminated under enumerated conditions.