Yes, he signed it but only for the one person/author who wrote a favorable book for him (stolen valor, I think). So in effect, NO he didn't sign it for those of us that would report the facts straight forward, but did sign it so he could say that he did sign it.
Kerry Hangs Back From Disclosure to All
The NY Sun June 9, 2005 Josh Gerstein
Did Kerry really release Navy records?
Chicagao Sun Times June 9, 2005 THOMAS H. LIPSCOMB