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Why do you ask? Have you pursued this in your language reference and failed to understand? Here's a cursory difference. If I give you a copy of something, you can edit it, scribble on it, feed it to your dog, or whatever else flips your skirt up, without affecting the original. If I give you access to the original, by telling you how to get at it, you can eff it up at your discretion. Whether or not that's a Good Thang depends on circumstances. That's why you need to think about it when you decide.
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