I was hoping for some guidance from the moderators with respect to this. The idea would be for a supplement requiring Traveller rules to fully use.
You've already been given the example of John Scalzi and
Fuzzy Nation, so some guidance exists whether you choose to believe it or not.
Scalzi originally wrote the book for himself, he didn't write it on spec or as part of a contract. When he gained success from the
Old Man's War series, he realized his earlier "Piper fanfic" might be worth publishing. Although
Fuzzy Nation only rebooted the events of
Little Fuzzy alone, Scalzi, his agent, and his publisher felt it was still necessary to negotiate with the copyright holders of the two Fuzzy sequels.
You've a recent example of a
real author, a
real agent, and a
real publisher acting on advice from
real lawyers to negotiate with the copyright holders of the
Little Fuzzy sequels before releasing a book which references
only Little Fuzzy.
The parallel between Scalzi's
Fuzzy Nation which "only" referenced the public domain
Little Fuzzy and your proposed Piper/Norton setting materials which "only" reference those Piper/Norton works which are in the public domain should be rather obvious.
YM will undoubtedly V.
