If you purchased any music from iTunes between 2003 and you downloaded tracks with DRM in them. Apple's long since removed the DRM, but you might not have. Wired shows how to update your music library with the new, DRM-free versions.
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Learning even just the basics of photography takes a bit of work and one of the more complex ideas is the relationship between ISO, aperture, and shutter speed. German photography blog Photoblog Hamburg has a graphic explaining how it works.
Say you have a movie on DVD, but you want to watch it on your phone, tablet, somewhere else. You can "rip" that DVD—or turn it into a movie file on your computer—to play it wherever you want. Here's how to do it.