Steps to reproduce:
- on a fresh XE instance, create a new "space" called "ForGuests"
- on that space, give the edit right to guests
- as a guest, try to create a page under "ForGuest" -> you can
- as a guest, try to copy the home page -> you cannot
- as a guest, go to http://localhost:8080/xwiki/bin/view/Main/Welcome?xpage=copy -> you are not allowed
Since guests have the edit right on some place inside the wiki, they should be able to copy any page (as soon as the target is inside the "ForGuest" space).