diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..fe463e0f7888bbf8b82e42d55f5743508ddafb7e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,408 @@
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diff --git a/LICENSE-APACHE-2.0-UNDERLYING-BigCodeBench.txt b/LICENSE-APACHE-2.0-UNDERLYING-BigCodeBench.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d645695673349e3947e8e5ae42332d0ac3164cd7
--- /dev/null
+++ b/LICENSE-APACHE-2.0-UNDERLYING-BigCodeBench.txt
@@ -0,0 +1,202 @@
+
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diff --git a/LICENSE-MIT-UNDERLYING-SWE-bench.txt b/LICENSE-MIT-UNDERLYING-SWE-bench.txt
new file mode 100644
index 0000000000000000000000000000000000000000..969657c73e7be4c9a796dfac715fb0d57b2acf8a
--- /dev/null
+++ b/LICENSE-MIT-UNDERLYING-SWE-bench.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Carlos E Jimenez, John Yang, Alexander Wettig, Shunyu Yao, Kexin Pei, Ofir Press, Karthik R Narasimhan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/LICENSE-MIT-UNDERLYING-SWE-bench_Pro.txt b/LICENSE-MIT-UNDERLYING-SWE-bench_Pro.txt
new file mode 100644
index 0000000000000000000000000000000000000000..27dc0c8983e0cac304b15419b40219b5c28d7167
--- /dev/null
+++ b/LICENSE-MIT-UNDERLYING-SWE-bench_Pro.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Scale AI, Inc
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/LICENSE-MIT-UNDERLYING-SWE-smith.txt b/LICENSE-MIT-UNDERLYING-SWE-smith.txt
new file mode 100644
index 0000000000000000000000000000000000000000..560709614b2fd8d4d746be4b70342da2b88f0cf8
--- /dev/null
+++ b/LICENSE-MIT-UNDERLYING-SWE-smith.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 John Yang
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000000000000000000000000000000000000..4d726bb1fab99784c984b9a1f69fa9cab2549ef3
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,26 @@
+SWEGraph v2 — FREE SAMPLE
+Copyright (c) 2026 williamTLmiller (energea@energeatech.com)
+
+WHAT THE CC BY-NC 4.0 LICENSE IN THIS REPOSITORY COVERS
+  Only williamTLmiller's normalization and packaging work: the proof-chain
+  tables, identity and contamination layer, task validity records, split
+  assignment, provenance manifests and documentation. Non-commercial use,
+  with attribution.
+
+WHAT IT DOES NOT COVER
+  The underlying releases this is built from — SWE-bench, SWE-bench Verified,
+  Lite, Multimodal and Multilingual (MIT), SWE-smith (MIT), SWE-bench Pro
+  (MIT tooling) and BigCodeBench (Apache-2.0) — and the open-source
+  repository content they carry, which stays under each repository's own
+  license. Copies of the source licenses are included as
+  LICENSE-*-UNDERLYING-*.txt. Nothing here restricts what you may do with
+  those sources obtained from their publishers.
+
+NOT AFFILIATED
+  Not produced, reviewed or endorsed by the authors of any source dataset.
+
+ATTRIBUTION
+  "SWEGraph v2 sample, MatrixNorm normalization by williamTLmiller, derived
+  from SWE-bench, SWE-smith, SWE-bench Pro and BigCodeBench."
+
+The full dataset is available under a separate commercial license — see README.md.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..a7f42f5057c6b69f7c53b8587ffb3e2d9dc54f5c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,187 @@
+---
+license: cc-by-nc-4.0
+language:
+- en
+pretty_name: SWEGraph v2 — Free Sample
+task_categories:
+- text-generation
+tags:
+- code
+- software-engineering
+- swe-bench
+- swe-smith
+- coding-agent
+- benchmark
+- contamination
+configs:
+- config_name: agent_tasks
+  data_files:
+  - split: train
+    path: "parquet/agent_tasks.parquet"
+- config_name: contamination_groups
+  data_files:
+  - split: train
+    path: "parquet/contamination_groups.parquet"
+- config_name: diff_hunks
+  data_files:
+  - split: train
+    path: "parquet/diff_hunks.parquet"
+- config_name: environments
+  data_files:
+  - split: train
+    path: "parquet/environments.parquet"
+- config_name: eval_tasks
+  data_files:
+  - split: train
+    path: "parquet/eval_tasks.parquet"
+- config_name: execution_proofs
+  data_files:
+  - split: train
+    path: "parquet/execution_proofs.parquet"
+- config_name: heldout_eval
+  data_files:
+  - split: train
+    path: "parquet/heldout_eval.parquet"
+- config_name: identity_groups
+  data_files:
+  - split: train
+    path: "parquet/identity_groups.parquet"
+- config_name: issues
+  data_files:
+  - split: train
+    path: "parquet/issues.parquet"
+- config_name: pull_requests
+  data_files:
+  - split: train
+    path: "parquet/pull_requests.parquet"
+- config_name: quality
+  data_files:
+  - split: train
+    path: "parquet/quality.parquet"
+- config_name: repos
+  data_files:
+  - split: train
+    path: "parquet/repos.parquet"
+- config_name: split_manifests
+  data_files:
+  - split: train
+    path: "parquet/split_manifests.parquet"
+- config_name: split_memberships
+  data_files:
+  - split: train
+    path: "parquet/split_memberships.parquet"
+- config_name: task_validity
+  data_files:
+  - split: train
+    path: "parquet/task_validity.parquet"
+- config_name: tests
+  data_files:
+  - split: train
+    path: "parquet/tests.parquet"
+- config_name: train
+  data_files:
+  - split: train
+    path: "parquet/train.parquet"
+---
+
+# SWEGraph v2 — Free Sample
+
+A free, deterministic ~10% sample of **SWEGraph v2**: the complete SWE-bench family,
+SWE-smith and BigCodeBench normalized into proof chains (`repo -> issue -> patch -> diff
+hunks -> tests -> agent task -> eval task`) with identity/contamination groups and a
+leakage-audited split. The full package is sold separately (see below).
+
+* **License:** CC BY-NC 4.0 for the MatrixNorm normalization/packaging layer (see
+  [Licensing](#licensing)).
+* **Format:** gzipped **CSV** in `csv/` (all columns as text; list fields pipe-delimited) plus
+  a **Parquet mirror** in `parquet/` with identical rows, used by `load_dataset` and the viewer.
+
+```python
+from datasets import load_dataset
+tasks = load_dataset("williamTLmiller/matrixnorm-swegraph-v2-sample", "agent_tasks", split="train")
+```
+
+## How the sample was drawn
+
+* **Unit = repository family** (a SWE-smith mirror belongs to its upstream's family).
+  Keep a family iff the first byte of SHA-1(`"sample:" + family name`) is `< 26`
+  (of 256).
+  Families are kept whole, so contamination groups and partitions are never cut.
+* **Same rule on every table**: tables with a `repo_id` keep the sampled families; group,
+  quality, validity, proof, environment and membership rows are kept when they refer to a
+  kept task or record. `split_manifests` is included in full.
+* The `split` column is the full package's partition, unchanged. Because whole families are
+  sampled, a sample may contain no validation or test family.
+* Built 2026-10-23T22:50:54Z.
+
+### Rows per table
+
+| Table | Full package | This sample |
+|---|---:|---:|
+| `agent_tasks` | 83,357 | 6,265 |
+| `contamination_groups` | 250 | 23 |
+| `diff_hunks` | 136,336 | 11,892 |
+| `environments` | 642 | 128 |
+| `eval_tasks` | 5,213 | 353 |
+| `execution_proofs` | 5,213 | 353 |
+| `heldout_eval` | 16,822 | 1,663 |
+| `identity_groups` | 21,073 | 1,260 |
+| `issues` | 82,217 | 6,265 |
+| `pull_requests` | 82,217 | 6,265 |
+| `quality` | 254,489 | 19,173 |
+| `repos` | 345 | 25 |
+| `split_manifests` | 28 | 28 |
+| `split_memberships` | 88,570 | 6,618 |
+| `symbols` | 1,140 | 0 |
+| `task_validity` | 5,213 | 353 |
+| `test` | 764 | 0 |
+| `tests` | 235,416 | 16,393 |
+| `train` | 70,602 | 4,955 |
+| `validation` | 382 | 0 |
+
+## The full dataset
+
+The licensed package holds every table above in full, plus per-entity JSONL streams with the
+complete nested fields (including each task's full PASS_TO_PASS regression list), provenance,
+rights and leak-audit files. Perpetual, non-exclusive license for internal research,
+training and benchmarking; models you train are yours to commercialize; no redistribution
+of the dataset itself. **Contact:** energea@energeatech.com
+
+## Sources
+
+| Source | Rows used | License of the source release |
+|---|---|---|
+| SWE-bench (test, dev, train) | 2,294 + 225 + 19,008 | MIT |
+| SWE-bench Verified / Lite / Multimodal | 500 / 323 / 612 (subsets and extensions of SWE-bench) | MIT |
+| SWE-bench Multilingual | 300 | MIT |
+| SWE-bench Pro V2 (`default`; `hard` recorded as membership) | 642 | MIT tooling; task content under upstream repo licenses |
+| SWE-smith | 59,136 | MIT |
+| BigCodeBench v0.1.4 | 1,140 | Apache-2.0 |
+
+Task content (issue text, patches, tests) comes from public open-source repositories and
+remains under each repository's own license; the exporter only ships verbatim code text where
+`rights_manifest.csv` allows it.
+
+## Licensing
+
+* **This sample:** [CC BY-NC 4.0](LICENSE) — attribution, non-commercial — applies to the
+  MatrixNorm normalization and packaging layer.
+* **Underlying data:** the source releases keep their own licenses (copies included as
+  `LICENSE-*-UNDERLYING-*.txt`); repository content stays under each repository's license.
+  See [NOTICE](NOTICE).
+* **Commercial use** of the normalized package requires the paid license.
+
+## Limitations
+
+* Task validity gates are `not_run` until real execution evidence exists.
+* Issue and PR text is reproduced from public GitHub as published in the source releases.
+* Not produced, reviewed or endorsed by the authors of any source dataset.
+
+## Citation
+
+> SWEGraph v2 (free sample). MatrixNorm normalization by williamTLmiller, derived from
+> SWE-bench, SWE-smith, SWE-bench Pro and BigCodeBench. https://huggingface.co/datasets/williamTLmiller/matrixnorm-swegraph-v2-sample
+
+## Contact
+
+energea@energeatech.com
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