Some highly compressed versions might require a crack to bypass activation or DRM:

When you see a file claiming to be Call of Duty 4 compressed to an absurdly small size (like 100MB or 500MB), you should be skeptical. Here is usually what happens under the hood:

A "Repack" is a compressed version of the game that is usually created by trusted groups. They compress the game files heavily but do not remove content. Once installed, the game decompresses back to its original size.

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