DRM never works.
When I say "DRM doesn't work" but piracy does, this is because the goal set in mind is reading the book, or giving people access to content. DRM is a built-in bug, defective by design. Computers are bad enough without intentionally making them worse. Their function is not to control people but to empower them.
At the same time, this is not an endorsement of piracy, but a demand for DRM-free commercial products.