And they have, with DRM and all that. Only problem with it is that it's a PITA for honest customers, but technology evolves and people always find ways to build

And they have, with DRM and all that. Only problem with it is that it's a PITA for honest customers, but technology evolves and people always find ways to build better mouse-traps. i.e. publish serially and demand advances, like authors used to do.