Transfer of ownership nor CC licensing explains the lack of attribution, a sign of disrespect and disregard.
We've never been asked to change that, by Dave Winer or anyone else.
https://www.rssboard.org/rss-specification
This also includes a change to reflect that the Berkman Center for Internet & Society became the Berkman Klein Center for Internet & Society in 2016.
When I publish anything on the web, do I have to give credit to Tim Berners-Lee each time?
A specification isn't a badge of honor, it's a useful tool, one among many. Other than clarification of who is currently authority for, and making changes to, a specification, there should be no names on any spec or standard.
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Why would anyone want to invite unnecessary controversy when writing a spec?