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81 lines
3.6 KiB
Markdown
81 lines
3.6 KiB
Markdown
# Solvent License Boundary Architecture
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## The Problem
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MIT-licensed software (PageIndex) integrated with proprietary IP (CFF, eigenmass, NUVMAP)
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must be architected so the MIT license does NOT propagate to proprietary code.
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## The Solution: Clean Module Boundary
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```
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/home/allaun/ ← Workspace root
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├── third_party/ ← ALL MIT/LICENSE-FOREIGN CODE
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│ └── pageindex/ ← VectifyAI/PageIndex (MIT)
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│ ├── LICENSE ← MIT license (UNTOUCHED)
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│ ├── ... ← MIT code (NEVER MODIFIED)
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│ └── NOTICE ← Attribution notice
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│
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├── cff/ ← PROPRIETARY CODE
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│ ├── core/
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│ │ ├── __init__.py ← Proprietary header
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│ │ ├── cff.py ← Proprietary header
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│ │ ├── fingerprint.py ← Proprietary header
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│ │ └── schema.py ← Proprietary header
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│ ├── gpu/
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│ │ └── eigenmass_engine.py ← Proprietary header
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│ ├── adapter/ ← ADAPTER LAYER (Proprietary)
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│ │ └── pageindex_adapter.py ← Interfaces with MIT code, proprietary itself
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│ ├── nuvmap/
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│ ├── ingestion/
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│ └── ...
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│
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├── LICENSE ← Proprietary global license
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├── THIRD_PARTY_NOTICES.txt ← Lists ALL third-party licenses
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└── IP_BOUNDARY.md ← This document
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```
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## Key Rules (Legally Defensible)
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### 1. NEVER modify files inside third_party/
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- PageIndex source lives exactly as cloned
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- No patches, no inline changes, no forked copies
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- Configuration is done via env vars / config files OUTSIDE third_party/
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### 2. Adapter layer NEVER includes MIT code
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- pageindex_adapter.py imports PageIndex as a library
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- Does NOT copy, paste, or inline MIT-licensed code
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- Contains ONLY proprietary glue logic
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### 3. Proprietary modules NEVER import from MIT code directly
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- Only the adapter layer touches PageIndex
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- CFF core, eigenmass engine, NUVMAP engine remain clean
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- This prevents "derivative work" contamination
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### 4. Third-party notices file is COMPLETE
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- Lists ALL foreign licenses, their terms, and attributions
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- Updated whenever a new third-party dep is added
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### 5. Copyright headers on EVERY proprietary file
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- Standard header: "PROPRIETARY — ALL RIGHTS RESERVED"
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- Date, entity, and explicit prohibition of copying
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## Why This Works
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MIT license requires:
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1. Copyright notice included in copies of the MIT software → SATISFIED (third_party/ untouched)
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2. Permission notice included → SATISFIED (LICENSE file preserved)
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MIT does NOT require:
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- Derivative works to be MIT-licensed
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- Combined works to be MIT-licensed
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- Proprietary code that uses MIT code to be disclosed
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The adapter pattern ensures our code "uses" PageIndex (imports its API)
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without "modifying" or "distributing" it in a way that triggers copyleft.
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## Verification Checklist
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- [ ] All third_party/ files retain original copyright headers
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- [ ] All proprietary files have proprietary headers
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- [ ] No MIT-licensed code copied into proprietary directories
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- [ ] Adapter layer imports only, no inlining
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- [ ] THIRD_PARTY_NOTICES.txt is current
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- [ ] Root LICENSE file reflects proprietary status
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