A recording medium for protecting content data, and a method and apparatus for reproducing data are disclosed. A method for reproducing data includes the steps of: a) confirming information constraining output resolution of the data according to a region; b) comparing the information with region value indicating a region in which a player is to be played; and c) outputting the data according to the result of the comparison. Therefore, the apparatus limits data output resolution until a current time reaches an analog output sunset time, thereby protecting the content data. The apparatus can prevent content data from being illegally duplicated or distributed by a fraudulent user, and can assign different content protection degrees to individual regions, resulting in the creation of more convenient functions for a content provider (CP) and a legitimate user.