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One sentence and one paragraph. Without the adjectives you would cut anyway.
PATRON is an open source (AGPL-3.0) AI platform for law firms that runs on the lawyer's own machine instead of the vendor's cloud: it analyses case files, labels the source behind every answer, and keeps an audit trail verifiable without trusting the maker.
PATRON is built on the premise that the firm decides whether a client's file leaves its hardware. You can plug in your own model, including a local one, and the matter then runs fully offline. Every claim in an answer carries a source label in one of three classes: quote, paraphrase, or no basis in the documents. The history of work with the model goes into a ledger bound by a SHA-256 hash chain with a Merkle tree, which an auditor checks offline, without access to the firm's database and without reading the case file. The program is free, the code is open, and it ships alongside a catalogue of 45 connectors to public legal sources across 34 countries and EU law.
Technical facts
Three differentiators
The file stays on the hardware. Documents do not pass through MateMatic's servers. With a local model a matter can run with no network connection at all, which for professional secrecy is an architectural difference rather than a clause in the terms. A cloud model runs only if the firm chooses one.
The answer shows where it comes from. Every claim gets a label: a quote with a page number, a paraphrase, or no basis in the documents. The third class matters most, because it is what separates a tool from an oracle.
A ledger checkable without us. A SHA-256 hash chain and a Merkle tree. The auditor verifies consistency offline, with their own tool. The full documentation, including the list of evidentiary limits, is public.
Screenshots
Six frames from version 1.2.0. Full resolution, no frames and no watermark.
The mark: logo.svg, vector format. A PNG on a transparent background is not published yet - write and tell us the size you need, and we will send it.
If you are writing a round-up
Most AI round-ups for lawyers compare cloud tools against each other. The "local-first / on-premise" category usually does not appear in them, even though it is the first question a firm bound by professional secrecy asks: where do the case files physically sit while they are being analysed.
If you want to add that column, the criterion is checkable without our involvement. The question is whether the tool still works once you cut off its internet, and whether that can be verified in the code. The answer "we have encryption and a DPA" does not address it.
A MateMatic reading of data protection and professional secrecy, not a position of any bar association.
About the company
MateMatic Solutions Sp. z o.o. builds European LegalTech infrastructure in four layers: Repertorium (a corpus of Polish and EU law for people, applications and AI agents), PATRON (the lawyer's local workspace), Boutique (MCP connectors and skills) and implementation work in law firms. Registered office in Kraków, Poland. Wikidata entry: Q139680859.
We answer technical questions and provide material in other formats. If you are writing a round-up and something here is missing, tell us exactly what, and we will send it ready to paste.