It means the Digital Rights to the song have expired.
From Sony's site:
"This issue may occur if the license for the track you are trying to play has expired on the device. If you currently subscribe to a music subscription service, connect the device and sign into the account to refresh your license to allow for playback. You may need to do this once during each billing period to listen to the subscription music you have transferred. If you are no longer a subscriber to the service where you downloaded the file from, you can delete the song from your portable player to prevent this error from occurring each time you try to play the song back."
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