Is it ok to tamper with other people's work?

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Media captionWill Gompertz on vandalism, theft and deceit

From cover versions to fan fiction, we live in age of appropriation.

You can make big money from tampering with other people's work.

But should you? And, where do the boundaries lie? Picasso said "good artists copy, great artists steal" - but that's isn't always a winning argument.

Watch me discuss this - and Fifty Shades of Grey - in my latest vlog.

Filmed at the Cinema Museum in Lambeth, London

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