Subscription rights?

I don’t use Windows Media Player 11 for much.  I use it to watch the occasional video downloaded from the web, and to look at some of my own videos from my camera.  I don’t buy music or any other content that I would require a license to play in Windows Media Player.  So I was a little surprised at the following dialog, which appeared when I exited Windows Media Player:

image

“Canceling the download of subscription rights”.

I wonder which subscription rights weren’t downloaded, and what content I’m no longer allowed to play as a result.