DLC, or Downloadable Content, refers to additional game content that can be downloaded and added to the base game. In the case of Rocksmith 2014, DLC PKG files contain new songs, artists, and gameplay features that expand the game's library and functionality. For PS3 users, DLC PKG files are specifically designed to work with the PlayStation 3 console.
: You can still import songs from the original 2011 Rocksmith if you own the original disc and purchase the Rocksmith Disc Import Pack from the in-game shop. rocksmith 2014 ps3 dlc pkg