If you thought the only way to edit the files on a DVD was to rip it first, then you’ll be happy to know that Adobe Premiere Pro can edit the native .VOB files directly. For top performance, first copy all the files to your hard drive before editing.
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To install Premiere Pro CS6, follow this guide: http://i.imgur.com/5Yz0jKg.png
For a tutorial on how to install Encore, watch this tutorial: https://www.youtube.com/watch?v=ULYmSdv3FkU