> ## Documentation Index
> Fetch the complete documentation index at: https://doc.blueapi.ir/llms.txt
> Use this file to discover all available pages before exploring further.

# License Compliance Matrix and Rules

> License compatibility matrix, attribution requirements, redistribution rules, and a decision tree for merging models under different open-source licenses.

EMEP merges models from diverse sources. Each source carries a license that constrains redistribution, attribution, and commercial use. This page defines the compatibility matrix, the decision logic for merge eligibility, and the attribution rules that apply per license family.

## Compatibility Matrix

Rows: source license. Columns: target license of the merged output. Cells indicate whether a merge is permitted without additional review.

|                 | Apache-2.0      | MIT             | BSD-3-Clause    | Llama Community | Gemma Terms     | Mistral         | GPL-3.0      | Custom          | Unknown      |
| --------------- | --------------- | --------------- | --------------- | --------------- | --------------- | --------------- | ------------ | --------------- | ------------ |
| Apache-2.0      | Compatible      | Compatible      | Compatible      | Review Required | Review Required | Review Required | Incompatible | Review Required | Incompatible |
| MIT             | Compatible      | Compatible      | Compatible      | Review Required | Review Required | Review Required | Incompatible | Review Required | Incompatible |
| BSD-3-Clause    | Compatible      | Compatible      | Compatible      | Review Required | Review Required | Review Required | Incompatible | Review Required | Incompatible |
| Llama Community | Review Required | Review Required | Review Required | Compatible      | Review Required | Review Required | Incompatible | Review Required | Incompatible |
| Gemma Terms     | Review Required | Review Required | Review Required | Review Required | Compatible      | Review Required | Incompatible | Review Required | Incompatible |
| Mistral         | Review Required | Review Required | Review Required | Review Required | Review Required | Compatible      | Incompatible | Review Required | Incompatible |
| GPL-3.0         | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Compatible   | Incompatible    | Incompatible |
| Custom          | Review Required | Review Required | Review Required | Review Required | Review Required | Review Required | Incompatible | Review Required | Incompatible |
| Unknown         | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Incompatible    | Incompatible | Incompatible    | Incompatible |

"Compatible" means merge proceeds with standard attribution. "Review Required" triggers a legal workflow before merge. "Incompatible" blocks the merge.

## Decision Tree

```mermaid theme={null}
flowchart TD
    START([License Check]) --> ALL_KNOWN{All licenses known?}
    ALL_KNOWN -->|NO| BLOCK1[Block: Unknown license]
    ALL_KNOWN -->|YES| GPL_CHECK{Any GPL-3.0?}
    GPL_CHECK -->|YES| BLOCK2[Block: GPL incompatibility]
    GPL_CHECK -->|NO| MATRIX[Look up matrix cell]
    MATRIX --> RESULT{Cell value}
    RESULT -->|Compatible| ALLOW[Allow merge]
    RESULT -->|Review Required| LEGAL[Route to legal review]
    RESULT -->|Incompatible| BLOCK3[Block: Incompatible]
    LEGAL --> APPROVED{Approved?}
    APPROVED -->|YES| ALLOW
    APPROVED -->|NO| BLOCK3
```

## Attribution Requirements

| License Family  | Requirement                                                                          |
| --------------- | ------------------------------------------------------------------------------------ |
| Apache-2.0      | Preserve copyright notice, license text, and NOTICE file; state changes              |
| MIT             | Preserve copyright notice and permission notice                                      |
| BSD-3-Clause    | Preserve copyright notice, disclaimer, and attribution                               |
| GPL-3.0         | Preserve license, provide source, state changes; copyleft applies to derivative work |
| Llama Community | Acceptable use policy compliance; output attribution per Meta terms                  |
| Gemma Terms     | Use restrictions per Google terms; output attribution required                       |
| Mistral         | Per Mistral AI terms; commercial use may require separate agreement                  |
| Custom          | Follow custom terms stored in registry metadata                                      |

The merge output inherits the most restrictive license among inputs. If any input is GPL-3.0, the output is GPL-3.0. If any input requires review, the output requires review.

## Redistribution Rules

* Released models include a LICENSE-BUNDLE file listing all input licenses and their texts.
* The ArtifactStore attaches the LICENSE-BUNDLE to every release artifact.
* DeploymentManager refuses to deploy a model whose license bundle is missing or incomplete.
* Enterprise deployments may apply additional license filters via configuration.

## Cross-Links

* [Model Supply Chain](/security/model-supply-chain)
* [Security Requirements](/security/security-requirements)
* [Model Registry](/tracking/model-registry)