[H]Assassin’s Creed® IV Black Flag™ - Special Edition [W] 8 Keys/Paypal

It's a Uplay code.

The Special Edition includes:

• Assassin’s Creed®IV Black FlagTM game
• Additional unlockable in-game content -
  Sacrificed Secrets: Recover Captain Drake’s lost treasures, including golden flintlocks and cutlass when exploring the exotic island of Sacrifices.
  Captain Kenway’s Legacy: Additional Single & Multiplayer items.