[re language copyrights]
I don't know about USA but just finished one big hunk of 'copyright' article in HU: so I believe I'm pretty up to date on the European interpretation (probably similar to international treaties) which explicitely does not allow to copyright ideas, or anything which isn't "materialised". So the toki pona or klingon website, books, recorded materials etc could be copyrighted, but the languages themselves cannot.
(As a sidenote the Klingon font faces/glyphs probably cannot be copyrighted either, just their actual representational forms, prints, etc.)
IANAL (but I have read the law recently :))
peter
ps: ...which doesn't mean they're not protected by other laws, though.