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Excluded.
They may have changed that (due to people possibly abusing it for the TAC [Treyarch Anti-Cheat) bans], while originally all of it got shared.
EDIT: Seems to possibly be the case: http://steamcommunity.com/app/202990/discussions/0/45350790754811631/
http://steamcommunity.com/app/202990/discussions/0/792924952461839512/
Multiplayer at the very least used to; unsure of its current situation, I'll test it tomorrow.
http://store.steampowered.com/account/managedevices <- Revoke.
Then go on his computer with your Steam account, navigate to Steam > Settings > Family.
Click "Authorize This Computer" and tick his Steam account as an eligible user and hit [OK]