The simple answer is probably... no. Adding an explicit license
retroactively was attempted many times (by myself and others) back
when it was all still freshly uploaded on the Wiki. This was always
met with loud protests and rollbacks (they would remove the license as
quickly as I added it) by one or two (mainly one) very vocal community
members (who weren't even documentation contributors).
The best we/I could do at the time was set explicit licenses where we
remembered (eg all the stuff under CC-By that Jean put into the Wiki),
and we put the rest of the Wiki under a general PDL license (which was
also loudly protested by the same one or two community members... no
one else cared).
The AOO community attempted to correct the licensing mess by keeping a
blanket license in place (and more visible) that serves the same
purpose as the blanket license that was in place when it was hosted by
Sun.
So, as it stands is what we have to work with (unless the AOO guys are
willing to make the changes, but I think they'll face the same issues
we did back in 2009-2011).
The PDL is a bit of an odd animal making it slightly more complicated
than it needs to be... a legacy of the Sun Microsystems days still
haunting things Even if the PDL was explicitly stated on every
single Wiki page, I have a feeling you'd clash with CC-BY-SA anyway.
Clayton
PS:I have no quibble with whatever license is given to the
documentation, and anything I personally wrote is free for anyone to
use under any license.