This page explains in detail the interactions between the Sleeping Dogs series and various Square Enix series.
Sleeping Dogs (The Square Enix Character Pack DLC)
August 14, 2012
In Sleeping Dogs,the Square Enix Character Pack features three new outfits for Wei Shen and three new weapons from Square Enix's Hitman , Just Cause (Eidos) and Deus Ex games. Each outfit includes its own buff and signature weapon.
Agent 47's suit grants you reduced attention from the police and comes with a silenced weapon. Assassinate your enemies with stealth, Hitman style.
The Sarif Industries armor reduces gunfire damage by 33% and comes with a futuristic, fully automatic combat rifle. This technology really is decades ahead of its time.
The Rico Rodriguez custom outfit allows you to hijack vehicles from a greater distance and comes with Rico’s signature pistol, which can fire explosive shells. Liberate those drivers at high speed!
Square Enix and Eidos held rights to all series.