DVD Copying
Most DVDs on the market are 5+GB size and will not fit directly onto a blank DVD.
You will need to search for and download DVDShrink (or similar) to rip, strip extras, compress and convert the DVD to fit on a 4.7GB blank DVD using a regular burning software (e.g. Nero)
Double-Layer drives are now available with 8.5GB blank DVDs (cheapest disks I've found are £6 each!!! - Verbatim DVD+R from PC World), but I've heard of problems with them when burning video/movies - "Layer transition may trigger a slight pause" = 20 seconds of blank screen!!!!!!!!!
All of this may prove completely useless if the DVD is using the latest encryption technology to prevent it being copied (or even read) on a PC!!