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License plan

Caliper uses a split license, matching the kind of artifact rather than applying one blanket license to everything. The corresponding LICENSE-* files live at the repository root.

ArtifactLicenseFile
Software — the Rust engine, the three faces, and toolingApache-2.0LICENSE-APACHE
Hardware — any open-hardware designsCERN-OHL-W (weakly-reciprocal open hardware)LICENSE-CERN-OHL-W
Documentation — docs and written material (including this book)CC-BYLICENSE-CC-BY

Why split

  • Apache-2.0 is a permissive, patent-grant software license — appropriate for an engine meant to be embedded and built on.
  • CERN-OHL-W is the standard weakly-reciprocal license for open hardware — the right instrument for physical designs, which Apache/CC do not cover well.
  • CC-BY is the natural fit for prose and documentation.

Status

These are repo-level LICENSE-* files per artifact type, not per-crate license fields. During the build-out, individual crate metadata may still carry a permissive MIT OR Apache-2.0 placeholder while the split-license files are finalized; the intent above is the plan of record.