Encryption and Security: Modern games use complex encryption to prevent piracy and cheating. A string like hdeyguxs3zaumvlgvybm2vyc could be part of a temporary decryption key or a unique machine-bound ID that validates your license.
If you did not launch Call of Duty but see cod.exe with a random argument in Task Manager, run a virus scan immediately. cod.exe hdeyguxs3zaumvlgvybm2vyc