'Art is theft,' Picasso once proclaimed. The wily old Spaniard was being provocative - he often equated theft to what could more benignly be called influence. But increasingly much of the best and, even, most original art involves an act or two of unequivocal, overt theft - an act of simple copy and paste. This book looks at modern-day art theft from all angles: art-historical tracing the lineage from Duchamp to Richard Prince, legal looking at recent key copyright cases, cultural drawing links to literary mash-ups and musical sampling, educational Kenneth Goldsmith's famous 'Uncreativity' classes and, of course, in terms of current art practice. It will look at the practices of major artists working across a variety of media.