Consistent substitution · Tokenization · Format preserved
Document pseudonymization
Replace personal data with coherent, controllable and reversible fictional equivalents. Keep your documents useful and correctly formatted while complying with the GDPR minimization principle.
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public/images/marketing/pseudo/preview.webp
Pseudonymization BETA: red detections + word list.
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Document usefulness without exposing real identities
Anonimatum pseudonymization goes beyond redaction: it replaces names, dates, amounts, addresses and identifiers with fictional values that respect type and format, so the document remains usable for testing, analytics or training.
Each run generates a reviewable, exportable equivalence map (JSON or encrypted). Consistency is guaranteed: the same original produces the same substitute across the document. Processing runs with local AI in the EU, without external LLM APIs.
Politeia Soft supports demos and scope for your organization. The product is Anonimatum: substitution, tokenization and partial masking methods that combine with the rest of the document stack.
Pseudonymization methods
Consistent substitution
Each data item is replaced with a realistic fictional equivalent (names, cities, addresses) while keeping consistency across the document: the same original always produces the same substitute.
Tokenization
Sensitive data is converted into unique, reproducible keys (e.g. EMAIL_001, NAME_1), ideal for traceability, matching and analytics without exposing real information.
Partial masking
A controlled portion of the data remains visible (up to a percentage of characters) and the rest is hidden, preserving context without revealing the full value.
Data format preservation
Substitutes are not generic labels: they respect the type and format of the original data so the document stays functional.
Dates
Relative shifting that preserves temporal distance between dates in the document—useful for timelines and deadlines without revealing real dates.
Amounts
Proportional scaling that keeps consistency between quantities and totals, so the document remains useful for financial testing.
Addresses and postcodes
Streets, cities and postcodes replaced with real dictionary equivalents, keeping postal look and structure.
Identifiers
DNI, NIE, CIF and IBAN generated with valid format and check digits, without matching real identities.
How it works
Upload and preview
We detect sensitive data and propose substitutes you can include or exclude before applying the change.
Adjust the map
Review and edit the equivalence map: correct substitutes, fix consistencies and confirm the scope of the process.
Apply and export
Download the pseudonymized document and the encrypted map for eventual reversal under your control.
Reversible and under your control
Each process generates an equivalence map linking every original value to its substitute. You can review, edit and export it encrypted. Reversal is only possible with that map, and all processing runs on European Union servers without your documents leaving the controlled environment.
- Equivalence map exportable as JSON or encrypted (.enc).
- Local processing in the European Union, with no external APIs.
- Guaranteed consistency: the same data always produces the same substitute.
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Pseudonymized document + download pseudo-map.json.
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Research and statistics
Share realistic datasets for studies without exposing real identities, keeping structure and field relationships.
Test environments
Generate test documentation with coherent data instead of production data, reducing risk in QA and demos.
Healthcare
Work with pseudonymized records while keeping clinical usefulness and consistency across episodes.
Legal sector
Prepare case files and judgments with reversible substituted data under control of the equivalence map.
Why pseudonymize with Anonimatum
When you need realistic, reversible data—not only opaque redaction marks.
Documents stay useful
Data type and format preserved: dates, amounts and IDs remain operable for testing and training.
Map under your custody
Reversal requires the equivalence map. You decide who stores it and in which format (JSON or encrypted).
Local AI in the EU
Detection and substitute proposals without sending the document to external LLM APIs.
Fits the stack
Works with PDF/Office, patterns, batches and human review when volume or criticality requires it.
FAQ — pseudonymization
How does it differ from redaction anonymization?
Redaction hides or removes the value. Pseudonymization replaces it with a coherent fictional equivalent so the document stays usable. Reversal is only possible with the equivalence map.
Can I edit substitutes before applying?
Yes. After detection you review the map, include or exclude matches and adjust equivalences before exporting the pseudonymized document.
Where are documents processed?
On European Union servers with Anonimatum local AI, without relying on uncontrolled external LLM APIs.
Are generated identifiers format-valid?
Yes. DNI, NIE, CIF and IBAN are generated with valid format and check digits, without corresponding to real people.
How do I request a demo?
Contact Politeia Soft. You will agree sample documents, method (substitution, tokenization or masking) and scope for your plan.
Pseudonymize with control and preserved format
Tell us your use case: we will guide you on methods, equivalence maps and training.
Contact us