I worked at a very small disc service (Like Discmakers but not) for a few years in the early 2000's. I can assure you that it would be near impossible, even at

I worked at a very small disc service (Like Discmakers but not) for a few years in the early 2000's. I can assure you that it would be near impossible, even at our tiny scale to check all of the jobs that came through our shop to be sure that none of them violated some copyright or another. We simply had, as part of our contracts that the entity submitting the job was authorized to use the material. Its part of a larger problem that copyright holders and law enforcement are pushing off their policing duties and costs onto businesses that shouldn't have this burden and often lack the ability to carry it out in any case. Come to think of it, its a lot like, ahem, stealing.