When you find a website or a download link promising a key.txt file filled with working activation codes for Call of Duty: Modern Warfare II , you are almost certainly looking at a scam. Modern digital distribution platforms like Steam and Battle.net use advanced DRM (Digital Rights Management) systems that make text-file key generators obsolete. 1. Unique, One-Time Use Codes

Even if you manage to open a .txt file containing 100 keys, every single one will fall into one of three categories: