how to determine from the command line whether a DVD is encrypted

I am currently ripping a bunch of DVDs. Some are encrypted, and some are not. My method for ripping a DVD depends on whether or not it is encrypted, so I am looking for a command-line method to determine if a DVD is encrypted or not.

My current way to detect whether a DVD is encrypted or not is that if it is encrypted, then running dd if=/dev/sr0 of=file.iso results in "Input/output error". I'm looking for a better way.

*Note: I know that DVDs are often encrypted with the Content Scramble System (CSS), and that you need to install a package such as libdvdcss to read encrypted DVDs.

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how to determine from the command line whether a DVD is encrypted

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