License

QECTOR Decoder v3 is source-available under the PolyForm Noncommercial License 1.0.0: free for personal, academic, and non-commercial research use. Company use, funded institutional work, SaaS, OEM integration, redistribution, or commercial benchmarking requires a commercial license.

Commercial addendum: what a paid licence changes

• Grants the commercial use that PolyForm Noncommercial withholds, for the seats and term you purchased.
• Internal use only. Redistribution, sublicensing, OEM bundling, and customer-facing SaaS or hosted APIs are excluded unless a written Enterprise/OEM agreement grants them.
• Activated by setting QECTOR_LICENSE and QECTOR_LICENSE_KEY to your Ed25519 token; verification is offline, with no licence server and no phone-home.
• The package is byte-identical for licensed and unlicensed users. Without a token a licensing notice prints on import (suppressible with QECTOR_SILENT=1); no functionality is gated or disabled.
• No warranty, indemnification, exclusivity, trademark, or patent grant is included by default.

License activation procedure

• Verify the purchase: the fulfillment worker accepts only a Stripe-signed live checkout event and records the reference, email, tier, and token in the protected fulfillment ledger.
• Install the official runtime: pip install --upgrade qector-decoder-v3==1.0.0 from the official PyPI project.
• Activate both variables: set QECTOR_LICENSE and QECTOR_LICENSE_KEY to the same token from the license email.
• Verify offline: python -c "import qector_decoder_v3 as q; print(q._is_license_active())" must print True; no license server or phone-home is involved.
• Keep the token with the Stripe invoice or payment confirmation. Never put it in a URL, issue tracker, chat, or public repository.

If either delivery email is missing or the token fails verification, contact [email protected] with the Stripe reference. Do not open a duplicate checkout or dispute while delivery is being repaired.

Full PolyForm Noncommercial License 1.0.0 text: polyformproject.org/licenses/noncommercial/1.0.0: also bundled with the package distribution.

QECTOR depends on open-source projects including Stim (Apache 2.0) and PyMatching (MIT); those licenses govern their respective components.

Commercial terms: pricing · refund policy · Contact [email protected]