It's a very interesting question... at what point (if any) does a story's main plot become part of the public domain? When does it become legitimate to tell the whole story, end included?
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I have to wonder about the classics. Who doesn't know the end to Hamlet? Or Pride and Prejudice? There are modern books as well: are there very many people who haven't had aspects of Harry Potter spoiled for them? Many of the most popular stories inevitably get told and retold so often that it becomes almost impossible to avoid having it "spoiled". At the end of the day, though, we do try to avoid spoiling books. We keep our blurbs to a relative minimum (though we really need to instate the 10% rule) and we typically keep our reviews spoiler-free, or at least include a spoiler alert to ward off readers who might not want to know what happens.
There's a level, though, when the surprises in the story cease to be the driving force of the book. It's a bit like watching the movie after reading the book (or the opposite) - you already know the story, but you're experiencing it for the nuances and the way it's told. The plot - the actual occurrences - aren't the only reason for enjoying the story. By this point, you're expected to know what happens. You're reading the book (or watching the movie) for everything else - the writing, the character building, the clever one-liners, the complexity... whatever it may be.
I don't know at what point we hit that expiration date but I think it does exist in some form. It's not necessarily correlated to the age of the story, but perhaps to the popularity and the ubiquity. I'd never consider telling someone the development and ending of All Quiet on the Western Front, but no one really hides Lord of the Rings' ending - in fact, you're almost expected to know what happens (vaguely, at least). The more people discuss a good story, the more likely others are to be exposed and that exposure doesn't mean that you'll necessarily enjoy the story any less. Look at retellings, look at the classics.
I think there is a spoiler alert expiration date. For most books, at least (there are obviously a few books that hinge on certain surprises or lose some of their power once you know the end... All Quiet on the Western Front comes to mind again). It changes from book to book and it isn't set in stone, but I believe it's there. What do you guys think?