Is there support for digital rights management (DRM) in HTML5 video?
HTML5 doesn’t provide direct support,nor any barrier,to using DRM in video. It currently expects this to be handled by the particular codec/implementation. There are implementations which allow for DRM in HTML5 video.

Is dealing with DRM in scope for HTML5?
If enough stakeholders want to standardise some aspect of handling DRM in HTML5 itself as part of the inclusion of video and audio media,then it makes sense for W3C to help standardise an approach which meets the needs of the market. However like all W3C work,relevant stakeholders need to be and show they are committed to developing it rather than expecting it to happen on its own.

这意味着它目前不被支持，但已经在W3C bug跟踪器here上讨论了它。

更新：
对这个问题感兴趣的人可能想参考新encrypted media extension standard的工作草案。

更新：目前主要浏览器支持EME。