You won't be able to sell your copy of Infinite Warfare and keep playing the Call of Duty 4 remaster.
One of (if not the only) exciting thing about Call of Duty: Infinite Warfare is that it comes packaged with a HD remaster of Call of Duty 4, widely regarded as one of (if not the) best in the series. However, if you were planning on buying Infinite Warfare just for the remaster, then selling your copy of the game, you may be out of luck, as the official website for the game has been updated, stating that the Infinite Warfare disc is required to play.
"Modern Warfare Remastered is a full game download (game disc must be inserted to play Modern Warfare Remastered). Internet connection required," states the line in question. It was previously announced that MW: Remastered would be a digital-only product packaged with premium editions of IW. We naturally assumed that as with other digital products, it would simply be a download code that you redeemed once and was then tied to your account. It now appears that Activision is forcing players to keep their Infinite Warfare discs in order to play.
Obviously, if you purchase a digital version of Infinite Warfare, this will no longer apply.
Activision has not said if Modern Warfare Remastered will ever be sold on its own.
We've reached out for confirmation.