On the W3C FAQ on HTML5 it states:
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.
Which means it's currently not supported, but there has been a discussion about it on the W3C bug tracker here.
Update:
People interested in this subject might want to consult the working draft of the new encrypted media extension standard.
Updated: EME is currently supported in major browsers.
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