How can I verify if a file is protected by DRM?
On OS X, by command line or by other methods.
As Daniel Beck noted in comments, you can use the
mdls command to get the file metadata. The
kMDItemKind field should hold the info you’re looking for.
$ mdls plain-mp3.mp3 | grep kMDItemKind kMDItemKind = "MP3 audio" $ mdls protected-aac.m4p | grep kMDItemKind kMDItemKind = "protected MPEG-4 audio" $ mdls unprotected-aac.m4a | grep kMDItemKind MDItemKind = "Apple MPEG-4 audio"
(Note also the different extensions,
If you hear sound, there are no (effective) restrictions.
mplayer can be obtained from this place.
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: