What to do with sources that lack a copyright

[Andreas Rottmann <a.rottmann@gmx.at>]

I'm right now trying to debianize sqlite (will post ITP later) and in
the process change the build system to use automake (to make things
more understandable ;-)).

The sqlite source is uncopyrighted (quote from the homepage
<http://www.hwaci.com/sw/sqlite/>: Sources are uncopyrighted. Use for
any purpose.).

Can I simply put this explanation into the
/usr/share/doc/sqlite/copyright file, or should I choose a licence
(e.g. GPL/LGPL) for the packages? I could justify that by the
not-so-small changes in the build system.

Thanks for any hints,
        Andy
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