If you’ve landed on this page searching for a "Plants Vs Zombies Registration Key List," you are likely one of two types of people. Either you are a nostalgic gamer trying to unlock the full version of PopCap’s 2009 classic tower defense masterpiece, or you are someone who just purchased an old CD-ROM copy and lost the manual. Regardless of your reason, this article will explain the reality of registration keys for Plants vs. Zombies , why public "key lists" are dangerous, and how to legally and safely unlock the full game today. A Brief History: Why PvZ Used CD Keys When Plants vs. Zombies first launched on PC (Windows and Mac) via PopCap Games, it used a standard copy protection system. After installing the game, users were required to enter a Registration Key (also called a CD key or serial number) to unlock the full game. These keys were typically found on the back of the game manual or on a sticker inside the jewel case.