Wolfenstein: Enemy Territory – Official Dedicated Server Update Whether you actually have or can exercise those rights is another question.

TL DR: 'Add to Library' gives you more rights (IMO) than 'Free to Play', due to the former being an actual purchase, just at $0. Having said all this, I don't know of any games that have moved from a free to a paid model at all, let alone successfully… You potentially lose the game if/when the developer pulls it from Steam or if/when they decide they want to change it back to a paid model (although they could at this point chose to allow active players to keep a copy of the 'paid' version, free of charge). 'Free to Play' the game is not 'sold' to you, it is merely made available for you to play free of charge indefinitely. You potentially lose the game if/when the developer pulls it from Steam.

You have 'bought' the game, just at the cost of $0. 'Add to Library' as you said is a limited free promotion - it will later be put back on sale for $. It also means you own the game 'less' than you would with the 'Add to Library' games.

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