legal December 2025

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CC0-1.0 in tree-sitter-clojure / tree-sitter-clojure-orchard, previously vendored into rust-difftastic
by Michel Lind 29 Dec '25

29 Dec '25

Dear all, I maintain the `rust-difftastic` package, a structural diff tool; in a recent update it has started unbundling the tree-sitter parsers it used, and as part of the review process for the new crates, this came up: https://bugzilla.redhat.com/show_bug.cgi?id=2421761 - difftastic previously used tree-sitter-clojure - this is CC0-1.0 licensed which is no longer allowed for code in Fedora (but this usage might be considered grandfathered in -- though we'd need to file for a retroactive exemption I guess) - https://lwn.net/Articles/902410/ - tree-sitter-clojure is then forked to tree-sitter-clojure-orchard - conversation: https://github.com/Wilfred/difftastic/pull/915 - citing upstream not uploading to crates.io. Apparently there's yet another fork as well (which requires a newer Rust version) - the fork difftastic ended up using claims it is MIT licensed: https://codeberg.org/grammar-orchard/tree-sitter-clojure-orchard/blame/bran… - but the LICENSE file it bundled is still CC0-1.0 which is how this issue was surfaced Any suggestion how to proceed here? I'm temporarily yanking the Clojure support out of difftastic until this is resolved. Of question: - is such a relicensing away from CC0-1.0 by a fork allowed? In which case I will put up a PR to the fork so it carries both license texts and explain the relicensing - if not, does the grandfathering of existing CC0-1.0 software cover forks too? The difftastic upstream (cc:ed), after I brought this to his attention, has requested that the original tree-sitter-clojure be dual-licensed CC0/MIT, which will resolve this too: https://github.com/sogaiu/tree-sitter-clojure/issues/71 Best regards, -- _o) Michel Lind _( ) identities: https://keyoxide.org/5dce2e7e9c3b1cffd335c1d78b229d2f7ccc04f2 README: https://fedoraproject.org/wiki/User:Salimma#README

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legal December 2025