25.06.2026
Local AI for Law Firms: §203, Case Data and RAG
How local RAG systems unlock case knowledge, cite sources and preserve matter-level permissions in every answer.
#AI#LawFirm#DataProtection
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§203 · Case data · RAG
Local AI for law firms with GDPR and Section 203 requirements
Case-law research, draft pleadings and case knowledge are sensitive. We set up a local AI platform with controlled data sources, roles and documented access paths.
Local processing with controllable data pathsConnect firm software and DMS as a scoped projectNo ongoing API/token costs
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The situation
What must be clarified before using AI
Client emails, pleadings and research cost hours - but putting case data into ChatGPT or Copilot lacks what §43e BRAO requires of a service provider: a written obligation, instruction on the consequences, careful selection and oversight.
A DPA alone does not define how client separation, source permissions and the §203 framework are implemented technically.
With external AI services, providers, subprocessors, storage locations and possible third-country transfers must be assessed. A locally configured platform can reduce those external data paths.
Legal framework
Local AI for GDPR and Section 203 requirements
We configure and operate AI Cube for the agreed GDPR and Section 203 scope. This includes controlled data paths, limited permissions, documented maintenance, the appropriate DPA and written secrecy obligations for the people involved. Legal evaluation of the specific use remains with the controller and its advisers.
What §203 StGB prohibits
§203 StGB protects confidential information entrusted by clients, patients and other parties. The necessary involvement of contributing persons is permitted. What matters is that access is limited to what is necessary, the people involved are bound to secrecy and the complete data and maintenance path is controlled.
Why cloud AI is the problem
With public AI services, inputs and documents leave your own infrastructure. Whether a service is suitable in a specific case therefore depends not only on a DPA, but also on data flows, subprocessors, access permissions and the actual use.
Why local processing helps
On-premises inference, local vector search and internally operated interfaces keep technical processing in your controlled environment. This reduces external data paths and subprocessors and allows access to be limited precisely.
Managed service with a secrecy obligation
When we provide setup or operations as a contributing person, the people involved accept a written secrecy obligation and are instructed about the criminal consequences. Where personal data is involved, this is combined with a DPA, limited administrative rights and documented maintenance paths.
What we deliver for it
These technical and contractual building blocks form part of the agreed §203 scope:
AVV
Data-protection layer
Written secrecy obligation
Secrecy and instruction on criminal consequences
Maintenance and access concept
necessary rights, logging and controlled paths
This content is general information and not legal or tax advice. The specific implementation under §203 must be reviewed professionally on a case-by-case basis.
AI Cube
AI Cube as a local platform for firm knowledge
AI Cube provides chat, local models and dedicated knowledge areas within the firm network. DMS connections, automated RAG pipelines and client separation are implemented separately after reviewing the existing systems.
Delivered ready to use within 10 working days
AI Cube
€6,490 excl. VAT one-time
Device, setup, briefing and shipping
€349.90 excl. VAT / month
AI Cube Care · first year accompanied, then cancellable monthly
- Compact AI appliance on NVIDIA GB10 with 128 GB unified memory and 1 TB NVMe
- Open WebUI with knowledge bases, groups and roles
- A local language model, a fast model for short tasks and an embedding model
- Hardened system, firewall, HTTPS on the local network
- Remote maintenance through NetBird, logged and switchable
- Handover documentation, a 30-minute briefing and shipping within Germany
- Two-year manufacturer warranty
Expandable when required
RAG, data sources, integrations, secure connectivity and custom workflows are scoped separately.
Operable for the long term
AI Cube Care keeps the device running: a monthly maintenance window, tested model updates with a rollback path, round-the-clock monitoring, ticket support and warranty handling. For confidentiality professionals we add a data processing agreement under Art. 28 GDPR and the written secrecy obligation under Section 203 (4) of the German Criminal Code, including instruction on the criminal consequences; on request remote access stays switched off by default.
Use cases
Where local AI can assist
These examples describe possible workflows. Data sources, permissions and professional review are defined for the concrete use case.
Case-law and precedent research via semantic search (RAG)
Draft pleadings and opinions from your templates
RAG over approved case files or a DMS after reviewing interfaces and source permissions
Contract analysis and clause review
Internal knowledge base: new staff find answers to typical cases
Deadline and inquiry triage
Our approach
Advise. Build. Operate. From one team.
Sovereign AI is a lifecycle, not a device purchase - and everything stays on your infrastructure.
01
Advise & design
Workshop, sizing, data classification and §203 contract framework. We understand your stack, professional software and compliance requirements before we recommend.
02
Build & integrate
On-premise build on your hardware, RAG on your documents with access control, integration into your professional software, secrecy obligation + DPA.
03
Operate & maintain (optional)
Updates, monitoring, model upgrades and RAG maintenance as a service contract - or you operate fully yourself. Handover and knowledge transfer included.
From one house
The full service range for your local AI
From hardware and inference through RAG and integration to operations and security - no interface ping-pong between advice, build and operations.
Local AI infrastructure
Knowledge & RAG
Integration & development
Enquiry
Assess local AI for Law Firm
Describe the workflow and data that should be processed locally or in a controlled environment.
Frequently asked questions
Through local processing, clearly separated data sources, roles, audit logs and documented maintenance access. You align the specific legal framework with your professional advisers.
A DPA is only one part of the assessment. For case data, data flows, subprocessors, permissions and the §203 framework must also be considered.
This is possible with an appropriate role, group and source architecture. Whether permissions can be enforced down to matter or document level depends on the connected source and its interfaces.
We usually deliver the AI Cube fully preconfigured within two weeks after configuration approval. Professional-software connections, automated RAG pipelines or larger infrastructure are planned separately.
Common open-source LLMs (e.g. Llama, Qwen, Mistral, Gemma) on NVIDIA hardware - from the AI Cube as a GB10 appliance for a single practice to an RTX GPU server for larger institutions. No vendor lock-in; model choice follows your hardware.
We document data flows, roles, technical safeguards and operational responsibility. For a §203 scope, we conclude the appropriate DPA and require the people involved to accept a written secrecy obligation that includes instruction on the criminal consequences.
The AI Cube costs EUR 6,490 excluding VAT as a one-time purchase for the 1 TB version, including setup, briefing and shipping. On top of that comes AI Cube Care at EUR 349.90 excluding VAT per month for patching, backup, monitoring and support; the first twelve months run with the device, cancellable monthly after that. Integrations and larger deployments are quoted separately.
Yes. We hand over with documentation and train your team - you can operate fully yourself. Maintenance, updates, model upgrades and RAG upkeep are available optionally as a contract, but are not mandatory.
Blog & Tutorials
Related Tutorials & Guides
Reviews
What clients say about working with us
From local AI integration to architecture, data sovereignty and ongoing operations.
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Head of IT Administration
ml&s - full-service provider for the electronics industry.
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Christoph Mußmann
Project Officer, DGHO e.V.
DGHO - German Society for Hematology and Medical Oncology.
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Managing Director, Annota GmbH
Annota - healthtech startup with an AI documentation assistant.
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Communications Manager, Golem.de
Golem.de - leading German IT news outlet.
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Project Manager, Stadtwerke Brühl GmbH
Stadtwerke Brühl - municipal energy and infrastructure utility.
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Data Manager, ARGE
ARGE Neue Medien - master data & digital standards for plumbing and building technology.
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CTO, EVA Real Estate
EVA Real Estate - leading real-estate agency in Dubai.
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Pascal Hakkers
Aphy AG
Aphy AG - AI platform for hotel back-office.
GermanyProxmox & VirtualizationBackupVPNSecurity
“WZ-IT provided very competent support in implementing our server and virtualization infrastructure. As part of the project, a Proxmox-based virtualization environment was set up along with a virtual machine for our application systems. Additionally, a structured backup concept was implemented. A particular focus was on security: the setup of a VPN tunnel and the clean implementation of encryption and access concepts were professionally executed. The structured consulting as well as the reliable and swift implementation deserve special mention. We are very satisfied with the services provided and are happy to recommend WZ-IT.”
John Hellmerichs
Managing Director, AInergy GmbH
AInergy - consultancy for energy and facility management.
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“Timo and Robin from WZ-IT set up a RocketChat server for us - and I couldn't be more satisfied! From the initial consultation to the final implementation, everything was absolutely professional, efficient, and to my complete satisfaction. I particularly appreciate the clear communication, transparent pricing, and the comprehensive expertise that both bring to the table. Even after the setup, they take care of the maintenance, which frees up my time enormously and allows me to focus on other important areas of my business - with the good feeling that our IT is in the best hands. I can recommend WZ-IT without reservation and look forward to continuing our collaboration! (translated)”
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Managing Director, Yonju GmbH
Yonju - business coaching and AI products.
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Odiseo Solutions - software engineering for the space industry.
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Kai Clauß
Head of Development, SweetConnect GmbH
SweetConnect - cross-manufacturer Industry 4.0 platform for confectionery production.
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