New Perspectives on Computer Concepts 2014, Introductory 17th Edition by June Jamrich Parsons,Dan Oja

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You've downloaded a movie from a new online store. You can watch it on your computer; but when you try to watch it on a large-screen television, you don't get a picture. You know the television is working, so you guess that the movie is protected by
that requires all devices to be compliant.