[fsflover]

> This of course comes at the cost of not being able to support non-free parts of the web standard such as DRM.

LGPLv3 would solve that, wouldn't it?

[i_read_news]

Or GPLv2 with binaries loaded at runtime, like Linux does. This is a definitive good candidate for v2 as not having DRM is simply just not going to work.