transferring albums to a network music server--one track on an album I purchased says 'protected'

so, it's an album of Barbara Cook that I purchased on Apple iTunes. 20 tracks on the album. When I transferred the album to my music server, 19 of the 20 tracks were successfully transferred.

one track doesn't appear at all on the server (though it exists in the library of the SSD attached to the server). it's my favorite track on the album, so of course I had to investigate.

on closer inspection, 19/20 of the tracks on the album are not protected...and this one track on the album is.

what can I do???

I want to be able to play that one track with the rest of the album. please advise. thank you!!