Usage: unpkg_vita.exe <input pkg file> [output folder] [-key=FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF]
To get your purchased game PKG link first log into: https://store.playstation.com then visit and copy raw data from this page: https://store.playstation.com/kamaji/api/chihiro/00_09_000/gateway/store/v1/users/me/internal_entitlements?start=0&size=800&fields=game_meta%2Cdrm_def