oh hey :)
"We are thrilled to announce that Nokia has transferred the copyright of Plan 9 to the Plan 9 Foundation. This transfer applies to all of the Plan 9 from Bell Labs code, from the earliest days through their final release."
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if the url goes down again, the editions are mirrored here: http://code.9front.org/hg/mit9
@dogstar these are the contents of the .tar files and I have not identified if/how the ISO files differ.