Windows Media Player cannot find the license for this file. The license might have been deleted or might have become corrupted.
If you have backup copies of your licenses, you can restore them, and then try playing the file again.
If you do not have backup copies of your licenses, you need to obtain a new license for the content. If you need a license for a CD track that you copied, rip (copy) the CD track again. If you need a license for a file that you downloaded from the Internet, return to the Web site where you got it and download the file again.
For more information about backing up and restoring licenses, see Windows Media Player Help.