You should read up an understand the difference between EME and CDMs. You are confusing them. I can't blame you, because the EFF/FSF are often conflating the tw

You should read up an understand the difference between EME and CDMs. You are confusing them. I can't blame you, because the EFF/FSF are often conflating the two. EME specifies a protocol to establish communication between a webpage and a DRM module. The DRM module is called the CDM (content decryption module). EME is what the W3C was standardizing, and can be implemented in open source. The CDM is not standardized and is a binary, closed source blob.