How do music subscription services make music expire? How do music download stores make music transferable only to a set number of computers?
Music that is delivered in WMA format can have digital rights protection. This allows the music provider to control how the music is distributed. Music subscription services can make the music expire and music download stores can dictate how many times the music can be moved to separate computers (while still letting you transport it to MP3 players and burn it to CDs as often as you wish).
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