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If I borrow something may I do something which I believe improves that thing, without the owners consent? For example if I borrow a library book and find an error in one of the facts printed there can I write a correction in the margin?

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One man's improvement is another man's damage. I would be surprised if "I believe it's an improvement" is strong enough to permit. – Monica Cellio Jun 12 '13 at 21:12
Would the question be any different for "if I see an error in a book at a book store would I be allowed to write a correction in the margin?"? – WAF Jun 12 '13 at 21:21
How about adding a diamond to a ring? – sam Jun 12 '13 at 21:58
@WAF might be harder to sell a book that was written in, even if the writing improves the book – not-allowed to change my name Jun 13 '13 at 1:14
@not-vram Might it not be similarly harder to lend out the book in the case of a library? – WAF Jun 13 '13 at 1:16

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