If PP doesn't sell its interest (aka the business just 'ends') it would be a great service if the owner made the companies works PUBLIC DOMAIN.
Legally, almost of the the books he sold were ALREADY public domain (any work of the governments is typically public domain anyway) and its black letter law that making a copy of a public domain work(s) confers absolutely no copyright to the person making the copy... ie the work doesn't go FROM public domain to copyright simply because a xerox or digital scan is made. The work must be transformative.
This is also true of the people who sell CD's or repro manuals. Claiming to own copyright is laughable... you don't.
http://www.copyright.gov/circs/circ14.pdf"Copyright Protection in Derivative Work
The copyright in a derivative work covers only the additions,
changes, or other new material appearing for the first time in
the work. It does not extend to any preexisting material and
does not imply a copyright in that material.
One cannot extend the length of protection for a copyrighted
work by creating a derivative work.
A work that has
fallen into the public domain, that is, a work that is no longer
protected by copyright, can be used for a derivative work,
but the copyright in the derivative work will not restore the
copyright of the public-domain material. Neither will it prevent
anyone else from using the same public-domain work
for another derivative work.In any case where a protected work is used unlawfully,
that is, without the permission of the copyright owner, copyright
will not be extended to the illegally used part"
But it would be a lot 'easier' if he simply posted in the MVPA rag that the PP books are all public domain.
As stated above, even if he sold the business... PP has no copyrights to enforce... but it would be a magnanimous thing to do for the hobby.
I'm waiting for the MVPA archives to start publishing documents... the are in the same boat.