This video shows you how to copy a DVD to a Mac using a free application called Handbrake. Open the Handbrake window, select the DVD you want to copy from where it's listed on the side, and click open to start scanning. After the scanning is done, a window will come up where you can choose which file on the DVD you want to copy. If you're copying a movie, it's usually the largest file. Choose what type of file you want to convert it to, and it will start copying. If the DVD is encrypted, you will have to download an application called VLC. Following these instructions will make it easy to copy DVDs to your Mac.
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