How to copy a DVD on Mac
It really depends what you are trying to do, Toast is the Daddy here but it's not free or particularly cheap.
If you are trying to copy a film, you need either Fairmount or Mac the Ripper (NB MTR is no longer developed and requires Rosetta to run on Snow Leopard) or the commercial Ripit (approx $20). You can also use handbrake for direct to device ripping.
There is also Liquid CD another free DVD programme.
You can make use of the constructed in disk energy to create and also melt photos.
There are numerous overviews on-line concerning this yet this set has images!