As far as Canada and the USA, the answer would appear to be "no" - prefaces and editorial notes are arguably the only the only works of original authorship associated with the urtext edition in question (apart from continuo realizations). As for the EU, there seems to be some confusion about the issue. For example, BSB has no problem posting critical editions complete with the preface, notes and (in at least one case) the continuo realization. Perhaps Germany's section 70 assigns the whole edition to the urtext category, which translates to a term of 25 years from publication. On the other hand, it's certainly not impossible that this is an foolish assumption on a librarian's part.