Hello,
I would like point out from my practice, that pdfs of copyright articles, books, book chapters and alike are not mandatory in our repository, but it is desirable to have them because in advancing process to the higher academic rank, full text should be accessible to the institution's academic council for making decision about promotion. So you have to make them accessible to academic council of your institution, so they could follow the scientific advances of a candidate.
Respectfully yours,
Nikola Scepancevic
Librarian, editor of repository
University of Belgrade, Faculty of Mathematics
Belgrade, Serbia