license: simplify to Apache 2.0 only; add DCO for contributor governance

Remove dual-license framing and the LICENSE-PROPRIETARY.md file. MNEMOS
is now single-licensed under Apache 2.0 as a clean community contribution.
Contributor governance is via the Developer Certificate of Origin (DCO
1.1) — contributors sign off each commit with 'git commit -s' rather than
signing a CLA that grants relicensing rights.

Files touched:
- LICENSE-PROPRIETARY.md: deleted
- README.md: License section simplified; FAQ entries about commercial
  licensing + hosted managed deployment removed
- CONTRIBUTING.md: DCO 1.1 text + sign-off requirement; previous dual-
  license contributor clause removed
- CHANGELOG.md: dual-license lines stripped from v3.1.0 release notes
- pyproject.toml: license-files = ["LICENSE"] (was LICENSE + LICENSE-PROPRIETARY)
- MANIFEST.in: drop LICENSE-PROPRIETARY.md include

No functional code changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: Jason Perlow <jperlow@gmail.com>

Author: perlowja

CHANGELOG.md

@@ -332,8 +332,6 @@ gateway.
 - All eleven SQL migrations ride inside the wheel as `db/*.sql`
   package data — accessible at runtime via
   `importlib.resources.files("db")`.
-- Dual-licensed: Apache-2.0 for the OSS distribution; a separate
-  proprietary commercial license is available by agreement.
 
 **Integrations**
 
@@ -375,5 +373,6 @@ gateway.
 
 ### License
 
-Apache-2.0 for the OSS distribution (`LICENSE`). A separate proprietary
-commercial license is available by agreement (`LICENSE-PROPRIETARY.md`).
+Apache License 2.0 — see [`LICENSE`](./LICENSE). Contributions accepted
+under the Developer Certificate of Origin (DCO), see
+[`CONTRIBUTING.md`](./CONTRIBUTING.md).

CONTRIBUTING.md

@@ -4,14 +4,78 @@ Thanks for your interest in MNEMOS.
 
 ## License
 
-By contributing to this repository, you agree that your contribution may be
-distributed under the repository's Apache License 2.0 terms and referenced in
-the project's dual-license commercial offering.
+MNEMOS is licensed under the Apache License, Version 2.0. Contributions to
+this repository are accepted under the same license and under the Developer
+Certificate of Origin (DCO) — see below.
+
+## Developer Certificate of Origin (DCO)
+
+We use the Developer Certificate of Origin 1.1 to track contribution
+provenance. By signing off on a commit, you certify that you wrote the code
+or otherwise have the right to contribute it under the project's open-source
+license. The full DCO text is at <https://developercertificate.org/>:
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+### Signing commits
+
+Every commit must include a `Signed-off-by` trailer attesting to the DCO.
+The easiest way is `git commit -s`, which auto-inserts the trailer using
+your configured `user.name` and `user.email`:
+
+```
+git commit -s -m "your commit message"
+```
+
+The trailer looks like:
+
+```
+Signed-off-by: Your Name <you@example.com>
+```
+
+PRs without DCO sign-off on every commit will be asked to amend
+(`git commit --amend -s`) or rebase with sign-off
+(`git rebase --signoff origin/master`).
 
 ## Development workflow
 
 - Use a feature branch for non-trivial changes.
-- Keep the upstream remote as the authoritative Git source, and use a local checkout for development and test runs.
+- Keep commits focused and reviewable; split large changes.
 - Run the default test suite before opening a PR:
 
 ```bash
@@ -28,6 +92,7 @@ pytest -q
 ## Reporting issues
 
 Please include:
+
 - what you expected
 - what happened
 - reproduction steps

LICENSE-PROPRIETARY.md

@@ -1,7 +1,6 @@
 include README.md
 include CHANGELOG.md
 include LICENSE
-include LICENSE-PROPRIETARY.md
 include CONTRIBUTING.md
 include SECURITY.md
 include DEPLOYMENT.md

MANIFEST.in

@@ -718,7 +718,7 @@ Yes. GRAEAE routes across any configured provider. Together AI and Groq are the
 
 ### Is there a hosted version?
 
-Not today. Self-hosted only. If you want a managed deployment, the proprietary commercial license covers custom arrangements — see `LICENSE-PROPRIETARY.md`.
+Not today. Self-hosted only.
 
 ### How is this different from Mem0 / Zep / MemPalace / LangChain memory?
 
@@ -736,13 +736,6 @@ Yes — we have been since December 2025. v3.0 is the first public release line,
 
 Currently manual — write a one-shot script that hits `POST /v1/memories/bulk` with your source data. Direct-import adapters for major competitors are on the roadmap but not yet shipped.
 
-### Apache 2.0 vs the proprietary commercial license — which one do I use?
-
-- **Apache 2.0** (`LICENSE`) — the OSS distribution. Free to use, modify, redistribute, fork, run commercially, etc. Standard permissive OSS license. **This is what you use.**
-- **Proprietary commercial license** (`LICENSE-PROPRIETARY.md`) — only matters if you need terms beyond Apache 2.0 (custom indemnification, specific SLA language, managed-service arrangements, vendor-of-record requirements). Most users don't need this. Contact the maintainer if you do.
-
-If you're not sure, it's Apache 2.0.
-
 ### Why port 5002 and not something normal like 8080?
 
 Historical. Earlier versions split MNEMOS (5000) and GRAEAE (5001) across two services; v3 unified them on 5002 to signal "this is the combined single service". Override with `MNEMOS_PORT` if 5002 is taken.
@@ -765,9 +758,6 @@ Yes. `Dockerfile` and `docker-compose.yml` ship in the repo; `docker compose up
 
 ## License
 
-MNEMOS is dual-licensed:
-
-- **Apache License 2.0** for the open-source distribution in this repository — see [`LICENSE`](./LICENSE).
-- **Proprietary commercial license** available by agreement for organizations that need alternative commercial terms — see [`LICENSE-PROPRIETARY.md`](./LICENSE-PROPRIETARY.md).
+MNEMOS is licensed under the Apache License, Version 2.0. See [`LICENSE`](./LICENSE) for the full text.
 
-Possession of this repository does not automatically grant the proprietary commercial license; contact the maintainer for those terms.
+Contributions are accepted under the Developer Certificate of Origin (DCO) — see [`CONTRIBUTING.md`](./CONTRIBUTING.md).

README.md

@@ -9,7 +9,7 @@ description = "MNEMOS-OS v3: Unified memory operating system with GRAEAE reasoni
 readme = "README.md"
 requires-python = ">=3.11"
 license = "Apache-2.0"
-license-files = ["LICENSE", "LICENSE-PROPRIETARY.md"]
+license-files = ["LICENSE"]
 authors = [{ name = "MNEMOS Contributors" }]
 classifiers = [
     "Development Status :: 4 - Beta",