Chapter XLVI: Section 3: has been supposed to have some particular reference to

and bearing on now existing copyrights taken under the present
law. On the contrary, I understand this section to be general and
permanent in its character, the purpose of the last three lines
being to specifically protect all copyrighted matter for its
proper term and no longer, when reproduced in whole or in part,
under license or otherwise, in connection with a later copyrighted
work. This section is very important as definitely clearing up for
the future a question which has been frequently raised in
connection with the present law.