I'm finding the restriction clause a little more obtuse then the original W3C clause:
No right to create modifications or derivatives of W3C documents is granted pursuant to this license, except as follows: To facilitate implementation of the technical specifications set forth in this document, anyone may prepare and distribute derivative works and portions of this document in software, in supporting materials accompanying software, and in documentation of software, PROVIDED that all such works include the notice below. HOWEVER, the publication of derivative works of this document for use as a technical specification is expressly prohibited.
The dropping of the underlined section makes the context of the allowed derivative works completely open ended. I suppose there is no harm in that, but the reference to implementation facilitation allows me to understand what is meant by software, while without it, I'm wondering what if any scope restrictions apply. It just doesn't roll off of the tongue so to speak, but maybe that is fine.