Terms of Sale

What you get

• GTP-v3.3 Fabrication Package ($49 USD) — a digital download bundle: fabrication-ready Gerbers, Excellon drill, IPC-D-356A netlists, DXF, the fabrication specification (when published), the five-round inspection campaign ledger, and the final inspection verdict with SHA-256 identity hashes. Delivered as download links on the confirmation page and by email.
• Same-Lot Measurement Kit ($99 USD, pre-order) — one fabricated set of all three matched boards (Control, Toroid, Hilbert) from the same production lot. Boards ship after fabrication and inspection. Pre-order funds the fabrication run.

License

Digital products are licensed for your personal use and study. You may not redistribute, resell, or publicly rehost the download bundles. You may use the board designs and netlists to verify the book's claims and to build your own test vehicles for that purpose.

Payment

All prices are in USD. Payments are processed by Stripe. By completing checkout you authorize Stripe to charge the listed amount.

Pre-orders

The Same-Lot Measurement Kit is a pre-order: fabrication has not been ordered yet, and your payment funds the same-lot run. Boards ship after fabrication and inspection. If same-lot fabrication is not confirmed within 60 days of your order, you receive a full refund — see our Refund Policy.

No warranty beyond the evidence

The fabrication package is a scoped PASS on fabrication-input criteria, not a blanket DFM certification. Products are provided "as is" for verification and study. Our liability is limited to the amount you paid. See the Refund Policy for your options if something is wrong.

Contact

Questions about these terms? Reach us through the Contact page.