Encrypted Media Extensions (EME) is a W3C specification for providing a communication channel between web browsers and the Content Decryption Module (CDM) software which implements digital rights management (DRM).
EME is based on the Media Source Extensions (MSE) specification,[4] which enables adaptive bitrate streaming in HTML audio and video, e.g. using MPEG-DASH with MPEG-CENC protected content.
[5][6] EME has been highly controversial because it places a necessarily proprietary, closed decryption component which requires per-browser licensing fees into what might otherwise be an entirely open and free software ecosystem.
[2] On the same day, the Electronic Frontier Foundation, who joined in 2014 to participate in the decision making,[10] published an open letter resigning from W3C.
[12] As of 2016[update], the Encrypted Media Extensions interface has been implemented in the Google Chrome,[13] Internet Explorer,[14] Safari,[15] Firefox,[16] and Microsoft Edge[17] browsers.