It seems we have no way of indicating the delivery method (original document, photocopy, scan in digital form, scan in digital form with DRM...). It could be useful
It could be set by default to "original document" if the document is a book, a thesis or a dvd, to "photocopy" for articles or chapters... But with the ability for staff to change this information if needed
We use "loan" (needs to be returned) and "copy" in our backend and also have the requirement of changing it. Sometimes a copy is ordered and the whole book is delivered :)