Here are three ways to download DVD to your Mac:

1. Use a DVD copy software like iFunia DVD Copy to save the DVD as a folder or an ISO file.
2. Use a DVD ripper software like DVD Ripper for Mac to import and convert the DVD movies to other formats.
3. Use a DVD ripping software like HandBrake with libdvdcss to rip the DVD and adjust the output settings.
4. Use the Disk Utility to copy the DVD as long as it is not copy-protected.