It's not clear. The tools are kept secret to avoid patching. But presumably they reverse engineered it and have a way to capture the raw stream. I know at one

It's not clear. The tools are kept secret to avoid patching. But presumably they reverse engineered it and have a way to capture the raw stream. I know at one point they were using Roku TVs or Fire TVs which allowed an older DRM standard. Now apparently there's a crack for Windows that's kept underground in the scene groups doing releases.