shares provided by, clauses (1) and (2) of subsection (a).

(3) Subject to the provisions of clause (4) of this subsection, a
further grant, or agreement to make a further grant, of any right
covered by a terminated grant is valid only if it is signed by the same
number and proportion of the owners, in whom the right has vested under
clause (2) of this subsection, as are required to terminate the grant
under clauses (1) and (2) of subsection (a). Such further grant or
agreement is effective with respect to all of the persons in whom the
right it covers has vested under clause (2) of this subsection,
including those who did not join in signing it. If any person dies
after rights under a terminated grant have vested in him or her, that
person's legal representatives, legatees, or heirs at law represent him
or her for purposes of this clause.

(4) A further grant, or agreement to make a further grant, of any right
covered by a terminated grant is valid only if it is made after the
effective date of the termination. As an exception, however, an
agreement for such a further grant may be made between the persons
provided by clause (3) of this subsection and the original grantee or
such grantee's successor in title, after the notice of termination has
been served as provided by clause (4) of subsection (a).

(5) Termination of a grant under this section affects only those rights
covered by the grants that arise under this title, and in no way
affects rights arising under any other Federal, State, or foreign laws.

(6) Unless and until termination is effected under this section, the
grant, if it does not provide otherwise, continues in effect for the
term of copyright provided by this title.

Section 204. Execution of transfers of copyright ownership.

(a) A transfer of copyright ownership, other than by operation of law,
is not valid unless an instrument of conveyance, or a note or
memorandum of the transfer, is in writing and signed by the owner of
the rights conveyed or such owner's duly authorized agent.

(b) A certificate of acknowledgement is not required for the validity
of a transfer, but is prima facie evidence of the execution of the
transfer if--

(1) in the case of a transfer executed in the United States, the
certificate is issued by a person authorized to administer oaths within
the United States; or

(2) in the case of a transfer executed in a foreign country, the
certificate is issued by a diplom