Further to my post #13 - reading the act it does state in section 50 that
Computer programs: lawful users
Section 50A: Back up copies
50A.-(1) It is not an infringement of copyright for a lawful user of a copy of a computer program to make any back up copy of it which it is necessary for him to have for the purposes of his lawful use.
(2) For the purposes of this section and sections 50B, 50BA and 50C a person is a lawful user of a computer program if (whether under a licence to do any acts restricted by the copyright in the program or otherwise), he has a right to use the program.
(3) Where an act is permitted under this section, it is irrelevant whether or not there exists any term or condition in an agreement which purports to prohibit or restrict the act (such terms being, by virtue of section 296A, void).
Okay - thats for computer programs. For movies etc it says in section 29 :-
Section 29: Research and private study.
29.-(1) Fair dealing with a literary, dramatic, musical or artistic work for the purposes of research for a non-commercial purpose does not infringe any copyright in the work provided that it is accompanied by a sufficient acknowledgement.
(1B) No acknowledgement is required in connection with fair dealing for the purposes mentioned in subsection (1) where this would be impossible for reasons of practicality or otherwise.
(1C) Fair dealing with a literary, dramatic, musical or artistic work for the purposes of private study does not infringe any copyright in the work.
So... (and I am not a lawyer) if your backup DVD is for private study it does not infringe copyright.
Also to infringe copyright is a criminal act not civil in the whole of the UK (although with some differences for NI, Scotland and England and Wales)
Would be nice is some lawyer could actually put the act into plain lanuage!!
You can read it for yourself here : http://www.jenkins-ip.com/patlaw/index1.htm