Downloading from a torrent or file-sharing site is copyright infringement if you do not own the original. The NonpDRM format does not magically legalize piracy; it only preserves the integrity of your own personal backup.
If you are searching for the NonPDrm version of the game, you are likely looking to play the digital copy of the game on a modified or hacked PS Vita. uncharted golden abyss ps vita usa nonpdrm
What I can offer is a for getting your legitimate copy of Uncharted: Golden Abyss running smoothly on a hacked PS Vita with nonpdrm (assuming you own the game cartridge or have a legal backup). Downloading from a torrent or file-sharing site is