I’m sure that somewhere, some has made one that is stored in some sort of restricted form. I’ve definitely purchased ones that are not. I don’t think that a blanket statement could be made either way. If you’re looking at a particular soundtrack, I’m sure that whoever is selling it will provide information about the format.
EDIT: Well, okay, you might not be notified if it uses some sort of digital watermark. I don’t know if that’s what you’re thinking of; it wouldn’t prevent one from being played, as is asked in your question, but it might permit an infringing copy to be traced back to an original purchase. There are definitely commercial audio vendors — I don’t know of specific examples involving game soundtrack audio — that do make use of digital watermarking and others that do not.
I’m sure that somewhere, some has made one that is stored in some sort of restricted form. I’ve definitely purchased ones that are not. I don’t think that a blanket statement could be made either way. If you’re looking at a particular soundtrack, I’m sure that whoever is selling it will provide information about the format.
EDIT: Well, okay, you might not be notified if it uses some sort of digital watermark. I don’t know if that’s what you’re thinking of; it wouldn’t prevent one from being played, as is asked in your question, but it might permit an infringing copy to be traced back to an original purchase. There are definitely commercial audio vendors — I don’t know of specific examples involving game soundtrack audio — that do make use of digital watermarking and others that do not.