(C) the rights of the author's children and grandchildren are in
all cases divided among them and exercised on a per stirpes basis
according to the number of such author's children represented; the
share of the children of a dead child in a termination interest can
be exercised only by the action of a majority of them.

(3) Termination of the grant may be effected at any time during a
period of five years beginning at the end of thirty-five years from
the date of publication of the work under the grant or at the end of
forty years from the date of execution of the grant, whichever term
ends earlier.

(4) The termination shall be effected by serving an advance notice
in writing, signed by the number and proportion of owners of
termination interests required under clauses (1) and (2) of this
subsection, or by their duly authorized agents, upon the grantee or the
grantee's successor in title.

(A) The notice shall state the effective date of the
termination, which shall fall within the five-year period specified
by clause (3) of this subsection, and the notice shall be served not
less than two or more than ten years before that date. A copy of
the notice shall be recorded in the Copyright Office before the
effective date of termination, as a condition to its taking effect.

(B) The notice shall comply, in form, content, and manner of
service, with requirements that the Register of Copyrights shall
prescribe by regulation.