David Holland wrote:
[archiving copy-protected CDs]
  Its all pretty flakey, depends ALOT on the burner, the
types of errors,
 and the phase of the moon.   The utilities are also pretty much Windows
 only.
 See 
http://www.cdmediaworld.com/hardware/cdrom/cd_protections.shtml for
 more than you probably wanted to know.
 Look into products like CloneCD, or Alcohol 120. 
Many thanks Dave - CloneCD did the job nicely in this particular case. (And
I'd never realised there were quite so many ways of crippling a CD!)
cheers
Jules