A DSc (Doctor of Science) or a DLitt (Doctor of Literature) and a number of other such doctorates are all Honary Degrees. They are awarded at the discretion of a university. Usually to academics within a university or previous graduates they represent an acknowledgement of an outstanding contribution of that person to his or her field. Except for celebrity awards, given for PR purposes, they are usually only given to people who already hold a PhD (or DPhil!!).