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How can I verify if a file is protected by DRM?

On OS X, by command line or by other methods.

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Not being familiar with OSX, is there not a properties section for the file, probably in an Advanced area which states it is protected? – Aaron Dec 12 '11 at 15:09
You're right, it's in the "More Info" of the file info panel in the Finder. – kenji Dec 12 '11 at 19:38
Added as answer for future visitors. – Aaron Dec 12 '11 at 19:40
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2 Answers

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In the finder, just Get Info on your file, and look at the More Info area. Within this area of the info panel it should state whether the file is protected or not. Here's an example of a protected AAC file:

Part of info panel

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up vote 0 down vote 
mplayer $filename

If you hear sound, there are no (effective) restrictions.

mplayer can be obtained from this place.

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