We know that for the Voynich MS the reason to remove the old cover was to get rid of the bookworms.
That removing the covers also helped to make the books less conspicuous may have been another motivation, but that is only speculation.
Furthermore, we do not know of course, if the previous cover was indeed one of Rudolf. It is simply a possibility. MS You are not allowed to view links. Register or Login to view. , which was mentioned on You are not allowed to view links. Register or Login to view. , had the cover with the arms of Rudolf removed, but at the same time the arms were preserved with the new cover.
That removing the covers also helped to make the books less conspicuous may have been another motivation, but that is only speculation.
Furthermore, we do not know of course, if the previous cover was indeed one of Rudolf. It is simply a possibility. MS You are not allowed to view links. Register or Login to view. , which was mentioned on You are not allowed to view links. Register or Login to view. , had the cover with the arms of Rudolf removed, but at the same time the arms were preserved with the new cover.