It's perfectly legal (in the US anyway) to backup your own DVDs to protect the original from little sticky fingers, accidents and use with your other Video Players.
There's been talk that the new Apple TV will only work with movies purchased through iTunes. Not true! Any movie that will stream with iTunes will work with Apple TV. Also, you'll be able to stream from up to 4 computers (Macs or PCs) on your network.
All this is possible with a recent merger of two great open-source utilities, Handbreak and MediaFork! The new merged utility, adopting the name MediaFork, is currently available for Macintosh (GUI), Windows (command-line or GUI) and Linux (command-line). I will be covering the use of the Graphic User Interface (GUI) version. There's also a special version for Mac called "Instant Handbreak" that removed all the confusing settings and just does the job for you.
A note about this specific DVD: I've taken the liberty to semi-hide the title to avoid inciting any publisher's anger. Please don't mention the name of the DVD when posting. I chose this particular DVD because it happens to be resistant to any other copying process. As it is, with this software, the first (very important) 7 minutes of the movie are lost.
Very few movies will have problems making a full copy.
Step 1: Getting the Software
MediaFork (currently 0.8.0 beta 1) is available for download at http://handbrake.m0k.org/?page_id=8 for all three platforms. Just choose the version for your computer and download it!
On the Mac, drag the application, MediaFork from the downloaded disk image or folder to your Utilities folder (located in the Applications folder). Then drag the newly copied MediaFork application, from your Utilities folder, to your Dock for easy access.
For Windows & Linux follow the included instructions for installation.
EDIT: The new link to Handbrake is http://handbrake.fr/. This now has presets for everything!