[aldoruizluna]

What was wrong

The root LICENSE was titled CERN Open Hardware Licence Version 2 - Weakly Reciprocal, but everything under the title was the CERN-OHL-S-2.0 (Strongly Reciprocal) text. A diff against SPDX text/CERN-OHL-S-2.0.txt shows only three differences: the title line and two typographic variants (Modifying and licence). GitHub's licence detection matched the body and classifies this repo as CERN-OHL-S-2.0.

Examples of what the shipped text said, compared with what W says:

Clause	Shipped (S)	CERN-OHL-W-2.0
Preamble	"CERN-OHL-W (weakly reciprocal) and this licence, CERN-OHL-S (strongly reciprocal)"	"this licence, CERN-OHL-W (weakly reciprocal) and CERN-OHL-S (strongly reciprocal)"
Preamble	"The CERN-OHL-S is copyright CERN 2020"	"The CERN-OHL-W is copyright CERN 2020"
1.1	"'Licence' means this CERN-OHL-S."	"'Licence' means this CERN-OHL-W."
1.8 External Material	missing	present (this is the weak-reciprocity carve-out)
4 Making and Conveying Products	strongly reciprocal, with no External Material exception	4.2 lets you convey a Product with External Material without its source
8 General	no W-to-S clause	you may treat W source as S if all Available Components qualify under S

12 per-cartridge LICENSE files were byte-identical copies of the same bad root text.

Why it matters

Every manifest declares commons_license: CERN-OHL-W-2.0, and internal-devops ADR-011 records W as the ruled commons licence, matching fashion-cabinet. The text this repo actually shipped gave different, stronger reciprocal terms than the ruling and the manifests.

What changed

These 13 files were replaced byte-for-byte with SPDX license-list-data text/CERN-OHL-W-2.0.txt, with no header added. The root LICENSE never had a header, so there was nothing to keep.

• LICENSE
• book-fold-phone/LICENSE, clamshell-dual-screen-handheld/LICENSE, extrusion-hyperobject/LICENSE, hinge-hyperobject/LICENSE, keyv2/LICENSE, locking-mechanism-hyperobject/LICENSE, microscope-slide-holder/LICENSE, microscope-slide-holder/libs/microscope-slide-hyperobject/LICENSE, microscope-slide-hyperobject/LICENSE, polydice/LICENSE, rugged-box/LICENSE, stemfie/LICENSE

The rule was to change only files that were exact copies of the bad root text (same sha1). All 12 cartridge manifests involved, including the nested microscope-slide-holder/libs/microscope-slide-hyperobject, declare commons_license: CERN-OHL-W-2.0.

What was left alone, and why

The repo has 52 LICENSE*/COPYING* files. The other 39 are unchanged:

• 27 short W notices. These are 8-line "licensed under the CERN-OHL-W v2" pointers: ab-drive, ab-front-idler, bed-extrusion-mount, captive-nut, commons-lib, corner-idler-bracket, din-rail-clip, faircap-filter, fasteners, framing-hyperobject, gears, glia-diagnostic, gridfinity, insert-jig, motor-mount, multiboard, parametric-connector, prosthetic-socket, rubiks-hyperobject, soft-jaw, thumb-screw, toolhead-proxy, x-carriage, xy-joint, z-belt-clamp, z-drive-housing, z-joint. They name the right licence. One small point: the URL is written https:/cern.ch/cern-ohl, with a single slash.
• 2 full W texts. custom-msh and julia-vase carry the real CERN-OHL-W-2.0 body. They differ from SPDX only in wrapping, indentation and the same three typographic variants, so their terms are already right.
• 10 files that need an owner decision. gear-reducer, implicit-lattice-hyperobject, maze, portacosas, relief, scara-robotics, spiral-planter, superformula, torus-knot and voronoi carry a 184-line file titled "Weakly Reciprocal". It is not the canonical text: it is a reworded, shortened version. For example, its 1.2(c) reads "work making Available Licencee's public licence grants the rights", which is not CERN wording. It is not the S defect this PR fixes, so it was not changed here. The same file sits at fashion-cabinet docs/licenses/CERN-OHL-W-2.0.txt and yantra4d docs/licenses/CERN-OHL-W-2.0.txt, which is why the FC copy was not used as the source. Fixing it is a separate decision for the owner, across all three repos.

How this was verified

• Root LICENSE before the change, compared with SPDX CERN-OHL-S-2.0.txt: 3 lines differ (title, Modifying, licence). The same file compared with SPDX CERN-OHL-W-2.0.txt: 109 lines differ.
• After the change: all 13 files have the same sha1 as SPDX CERN-OHL-W-2.0.txt (de1a34e1…).
• The SPDX text was checked against the sheet-hyperobjects LICENSE (already verified against SPDX). Word for word they differ only in three typographic spots: CERN- OHL-W, modifying and license in SPDX, against CERN-OHL-W, Modifying and licence there.
• The manifest bar from CI was run locally with the pinned keystone hyperobjects-spec@142db18, without a CAD kernel: y4d-spec check over every top-level cartridge with a project.json gave cartridges=512 failures=0 notes=36. The 11 changed top-level cartridges all print ok. The nested microscope-slide-holder/libs/microscope-slide-hyperobject is not in CI's glob. Run directly, it fails one rule about mode/part ids, which has nothing to do with the licence and is not touched here.
• python -m pytest .github/scripts -q gave 59 passed.
• Known gap: y4d-spec's declared-vs-shipped check (structure.shipped_license_rules) matches only the title line. That is why the S body passed CI under a W title. Making the check compare the body belongs in hyperobjects-spec and is not part of this PR.

GitHub's licence detection reads the default branch, so the repo badge changes from CERN-OHL-S-2.0 to CERN-OHL-W-2.0 only after this is merged.

🤖 Generated with Claude Code