Hi, don't redistribute means that you shouldn't put it anywhere where someone else can download it. Pretty much the same as a licensing music. You buy license to use the music track (for example in your youtube video) but you can't send it to your friend or put here on itch a file so everyone can download it and use it for free. If you'll make a game and then fell free to sell it on steam or itch.io but don't put pack files so everyone can download it for free. Thats all. Hope it helps.