# Shipped Assets — provenance and license facts

> Source of truth for LICENSES.md (written in plan 01-10). Every row must be
> traceable to a document that was actually read, not inferred.

## VRM character — avatar/assets/tutor.vrm

> **STATUS: FINAL (decided 2026-09-06, plan 01-10 Task 3).** The sourcing gate armed in plan 01-01 was
> re-raised at the phase-exit checkpoint and the owner chose **option 1 — keep this file** as the
> shipped character. Rationale: the embedded `VRMC_vrm.meta` (parsed from the file, below) permits
> redistribution, modification and avatar use by everyone with `creditNotation: unnecessary`, so no
> further permission or credit is owed; the page credits pixiv Inc. anyway (footer, About panel,
> README). The visible tell — a spec sample's name — is accepted for v1; a bespoke character remains
> a polish option for a later milestone, not an open gate. `LICENSES.md` carries this file's entry
> and `tests/e2e/test_avatar_loop.py::test_vrm_meta_matches_licenses` keeps the document, the
> binary and the page in agreement.

| Field | Value |
|---|---|
| Character name | VRM1_Constraint_Twist_Sample (embedded `meta.name`), model version `v1.0.1` |
| Author | pixiv Inc. (embedded `meta.authors` = `['pixiv Inc.']`) |
| Copyright | (c) 2022 pixiv Inc. (embedded `meta.copyrightInformation`) |
| Source | Official VRM specification sample repository, `vrm-c/vrm-specification`, path `samples/VRM1_Constraint_Twist_Sample/vrm/VRM1_Constraint_Twist_Sample.vrm` — https://github.com/vrm-c/vrm-specification/tree/master/samples/VRM1_Constraint_Twist_Sample (HTTP 200, verified 2026-08-27) |
| Download URL used | https://raw.githubusercontent.com/vrm-c/vrm-specification/master/samples/VRM1_Constraint_Twist_Sample/vrm/VRM1_Constraint_Twist_Sample.vrm (HTTP 200, verified 2026-08-27) |
| Terms URL | https://vrm.dev/licenses/1.0/ — VRM Public License 1.0 (HTTP 200, verified 2026-08-27) |
| VRM spec version | **VRM 1.0** (`extensions.VRMC_vrm.specVersion` = `1.0`), glTF binary container version 2 |
| Embedded meta (read from the file) | name=VRM1_Constraint_Twist_Sample authors=['pixiv Inc.'] licenseUrl=https://vrm.dev/licenses/1.0/ commercialUsage=corporation creditNotation=unnecessary avatarPermission=everyone allowRedistribution=true modification=allowModificationRedistribution copyrightInformation=(c) 2022 pixiv Inc. |
| Permissions relied on | `allowRedistribution: true` (this repo redistributes the file), `avatarPermission: everyone` (used as an avatar by any visitor), `modification: allowModificationRedistribution` (headroom to retarget or adjust and still redistribute), `commercialUsage: corporation` (the broadest tier — covers a public portfolio Space unambiguously) |
| Required credit string | **none required** — `creditNotation: unnecessary`. Credited voluntarily anyway as: `VRM1_Constraint_Twist_Sample (c) 2022 pixiv Inc. — VRM Public License 1.0` |
| File size | 10,776,032 bytes (10.28 MiB) |
| SHA-256 | `12c2b97e95e700783a6a550dc0eee2d7880aeedccef9ae67bc4c5a2f0f2631a2` |
| Git LFS | yes — `git check-attr filter` reports `filter: lfs`, and the LFS pointer's `oid sha256` equals the hash above |

### Why the embedded flags are the license answer, and the README is not

VRM Public License 1.0 is a **template, not a fixed grant.** It confers "Model Utilization" rights
unconditionally, but redistribution, avatar use, modification and commercial use are **per-file
flags set by the licensor inside the model's own `VRMC_vrm.meta` block.** Two files can both cite
`https://vrm.dev/licenses/1.0/` and grant materially different rights.

So the facts above were extracted by parsing this specific file's glTF JSON chunk, not read off a
repository README. Every flag this project relies on is explicit and permissive in the file itself.

The complete embedded `meta`, verbatim, for the record:

```
allowAntisocialOrHateUsage    : False
allowExcessivelySexualUsage   : True
allowExcessivelyViolentUsage  : True
allowPoliticalOrReligiousUsage: True
allowRedistribution           : True
authors                       : ['pixiv Inc.']
avatarPermission              : everyone
commercialUsage               : corporation
copyrightInformation          : (c) 2022 pixiv Inc.
creditNotation                : unnecessary
licenseUrl                    : https://vrm.dev/licenses/1.0/
modification                  : allowModificationRedistribution
name                          : VRM1_Constraint_Twist_Sample
thumbnailImage                : 18
version                       : v1.0.1
```

`allowAntisocialOrHateUsage: False` is the one restriction. It is not a constraint this project can
plausibly violate — a Japanese-language tutor has no such use path — but plan 01-10's `LICENSES.md`
should carry it so the restriction is stated rather than silently dropped.

### Capability check — this asset can actually satisfy AVTR-01 and AVTR-02

Verified by parsing `extensions.VRMC_vrm.expressions`: **18 preset expressions, 0 custom.**

```
aa, angry, blink, blinkLeft, blinkRight, ee, happy, ih, lookDown, lookLeft,
lookRight, lookUp, neutral, oh, ou, relaxed, sad, surprised
```

| Requirement | Needs | Present |
|---|---|---|
| AVTR-02 lip-sync | `aa`, `ih`, `ou`, `ee`, `oh` | **all five present** |
| AVTR-01 idle life | `blink` (plus `blinkLeft` / `blinkRight`) | **present** |
| Expression range (later phases) | `happy`, `angry`, `sad`, `relaxed`, `surprised`, `neutral` | present |
| Gaze (later phases) | `lookUp` / `lookDown` / `lookLeft` / `lookRight` | present |

This was measured, not assumed. Both avatar requirements in Phase 1 are satisfiable with this file.

Also present, and relevant to plan 01-03's renderer wiring:

- `extensionsUsed`: `VRMC_springBone`, `VRMC_vrm`, `KHR_materials_unlit`, `VRMC_materials_mtoon`,
  `VRMC_node_constraint`
- **54 humanoid bones** defined, including `hips`, `head`, `leftEye`, `rightEye`. There is **no
  `jaw` bone** — which is fine and expected: VRM lip-sync is driven by the `aa`/`ih`/`ou`/`ee`/`oh`
  blendshape expressions listed above, never by a jaw bone.
- This sample exists specifically to exercise **twist constraints** (`VRMC_node_constraint`) and
  spring bones. That makes it a slightly heavier load path than a plain character, which is useful:
  if plan 01-03's transport seam holds for this file, it holds for simpler ones.

## Not used, and why

**`AvatarSample_A`, `AvatarSample_B` and `AvatarSample_C` are NOT CC0.** Copyright is retained and
VRoid Hub conditions apply; VRoid's own FAQ prohibits redistributing them under a CC0 designation.
This is a widespread misconception, repeated confidently in many tutorials and blog posts. It is
recorded here so it is not reintroduced later in this repository.

Two further traps worth stating once, since they are the reason sourcing a VRM is a human decision
rather than a download:

- CC0 **cannot be set** on VRoid Hub, so any "CC0 on VRoid Hub" claim is false by construction.
- Enabling "Allow third-party usage" on VRoid Hub **overwrites** a model's embedded license with
  VRoid Hub's own conditions — so the embedded flags on a Hub-sourced model may not say what the
  original author intended.

## Sourcing decision (closed in plan 01-10)

The two options the gate offered, and the outcome:

1. **Keep this file — CHOSEN (2026-09-06).** Legally clean as recorded above; no action beyond the
   `LICENSES.md` entry, which exists and is machine-checked against the shipped file. The cost —
   shipping a spec sample named `VRM1_Constraint_Twist_Sample` on a portfolio piece — is accepted for
   v1 and credited openly rather than hidden.
2. **Author a bespoke character in VRoid Studio** (the original RESEARCH recommendation, estimated
   2-4 hours) — not taken in Phase 1. If a later milestone does it, the embedded `vrm.meta` must be
   set deliberately at export time and the `vrm_meta` block in `LICENSES.md` updated from the new
   file, because `test_vrm_meta_matches_licenses` fails the deployed suite until they agree.

**Fallback already vetted, if this file ever fails verification:** `Seed-san.vrm` by VirtualCast,
Inc., in the sibling samples path of the same repository — same permission flags and the same 18
presets, except `creditNotation: required`, which would make a visible credit string mandatory.

**Shape note recorded at the lip-sync review (docs/LATENCY.md § Lip-sync verification):** on this
model the `aa`/`oh` presets and the `ih`/`ee` presets are visually near-identical pairs; あ (tall
oval), い (flat, teeth visible) and う (small, pursed) are clearly distinct, which is what AVTR-02
asks for. A bespoke character could widen the five-way distinction; the pipeline drives all five
presets independently to weight 1.0 (reference sheet `docs/evidence/2026-09-06-viseme-ref-*.png`).

## Voice — VOICEVOX / ずんだもん

**Already recorded in full by plan 01-04. See `docs/VOICEVOX-SETUP.md`**, which carries all three
licence layers, the exact `VOICEVOX:ずんだもん` credit string, the placement standard, the flow-down
obligation, the Nemo pre-cleared swap, and the Open JTalk dictionary's BSD-3-Clause notice with its
dual Nara/Nagoya attribution. Not duplicated here; `LICENSES.md` (plan 01-10) should read that file
directly.

## Runtime libraries — recorded in LICENSES.md (plans 01-09 / 01-10)

three.js, `@pixiv/three-vrm` (both vendored under `avatar/vendor/`), transformers.js, and the Open JTalk dictionary are recorded in `LICENSES.md`. Note that this VRM
additionally exercises `VRMC_springBone`, `VRMC_node_constraint` and `VRMC_materials_mtoon`, all of
which are handled by `@pixiv/three-vrm` itself and add no separate licence entry.