Recent technological advances that enable consumers to copy creative works without compensating their owners have led to proposals for restrictions on copying. To analyze such restrictions, this paper considers two models of copying. The first model emphasizes the household production aspect of copying with costs differing across consumers, while the second relies on the fixed cost of copying technologies. In both models, a case can be made for restricting copying even in the short run if copying induces a large reduction in demand for originals relative to its effect on total consumption. The long-run case for restriction hinges additionally on the elasticity of supply and the value consumers place on product variety.