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Prior to 2009, most games released on Steam had traditional anti-piracy measures, including the assignment and distribution of product keys and support for digital rights management software tools such as SecuROM or non-malicious rootkits. With an update to the Steamworks SDK in March 2009, Valve added its "Custom Executable Generation" (CEG) approach into the Steamworks SDK that removed the need for these other measures. The CEG technology creates a unique, encrypted copy of the game's executable files for the given user, which allows them to install it multiple times and on multiple devices, and make backup copies of their software. Once the software is downloaded and installed, the user must then authenticate through Steam to de-encrypt the executable files to play the game. Normally this is done while connected to the Internet following the user's credential validation, but once they have logged into Steam once, a user can instruct Steam to launch in a special offline mode to be able to play their games without a network connection. Developers are not limited to Steam's CEG and may include other forms of DRM (or none at all) and other authentication services than Steam; for example, some games from publisher Ubisoft require the use of their UPlay gaming service, and prior to its shutdown in 2014, some other games required Games for Windows – Live, though many of these games have since transitioned to using the Steamworks CEG approach.


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Steam Workshop :: Transformers- The Planet Cybertron
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Steam Workshop :: Transformers Fall of Cybertron Music
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STEAM BOX :: Transformers™: Fall of Cybertron™

Cybertron