HELP !

I have recently started using iMovie and have completed 2 projects so far. When I want another copy of a DVD it takes ages to burn again (actually the asset encoding takes ages).

I believe it is possible to copy an existing DVD using something in OSX 10.3 Utilities. I have looked in Utilities and the only relevant app seems to be Disk Utility.
However I cannot find any reference in there to copying a DVD.

Can anyone advise please?

Regards,
Stephen Chape