Only the person who subscribed and is paying for that subscription can see it. Just like your phone bill, the records of a certain subscription are kept incase a problem comes up and it is needed as proof. Contact the company providing your subscription if you need to make that information more private.
Usually all a subscription means is that all episodes of the show will be recorded so you don't miss an episode. The only way someone could find out about it is if they got into your TiVo or computer & got really nosy.