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Re:Octotree – Proprietary Firefox extension contains AGPL-li... by cooltrbl on Saturday October 31, 2020 @05:15PM (#24955247)
Person A still have the IP of the software IMHO, so person A can do whatever with the software. Person B still have the latest-before-relicensed software, person B can fork or create new software based on latest-before-relicenced software.

Similarity like Qt software company doing the relicenced thing and Illumos project keeping latest-before-relicenced software.

Re:Octotree – Proprietary Firefox extension contains AGPL-li... by JW_00000 on Saturday October 31, 2020 @05:33PM (#24955370)
This is not true: person B owns the copyright to his/her contributions. As soon as person B added code, the copyright of the project no longer belonged solely to person A. And that's not a matter of opinion but legal fact.

It would however be possible for person A to remove all contributions of person B (and possibly rewrite the same functionality).