How it works
Nine gates. Cheapest checks first.
Every book walks the same pipeline, no favourites and no shortcuts. Fast checks on the metadata come first, so the expensive steps, full-text OCR and a complete AI reading — are spent only on the books that survive them. Out of every 1,000, about 120 ever reach the OCR stage.
Every verdict carries its reason and is stored permanently, and every rejection can be appealed.
The plain-language tour, for authors and readers ↗
The plain-language tour, for authors and readers: dsafe.us
- Suggested 1,000
- 1 Language 800 remain, 200 rejected
- 2 Classification 800 remain
- 3 Topic rules 240 remain, 560 rejected
- 4 Subject headings 120 remain, 120 rejected
- 5 Full text 120 remain
- 6 AI read 24 remain, 96 rejected
- 7 Final review 24 remain
- 8 Permanent record 24 remain
- 9 Appeal 24 remain
Step by step
The nine gates
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Gate 1: Language
The book is read and its language detected. Libraries shelve their national language, so others are automatically set aside.
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Gate 2: Classification
BERT, an ultra-modern and excellent classifier, reads the metadata and assigns a Library of Congress Classification, as a human cataloguer would.
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Gate 3: Topic rules
Filters out excluded topics (e.g., politics, religion, law) based on strict collection rules.
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Gate 4: Subject headings
The book is matched against 180,000+ Library of Congress Subject Headings to catch excluded topics.
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Gate 5: Full text
For the books that pass the metadata gates, the entire text is extracted via OCR.
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Gate 6: AI read
A frontier model reads the entire book to catch what metadata missed and assess educational quality.
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Gate 7: Final review
A final human-and-AI check confirms the book earns its certification.
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Gate 8: Permanent record
Every verdict (and its reasoning) is permanently stored on Arweave, ensuring public transparency.
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Gate 9: Appeal
Authors and readers can dispute any verdict. A fresh panel reviews reversed decisions.
Gate 3 · Topic rules The Library of Congress classes Ꭰ-SAFE excludes at gate 3
Filters out excluded topics (e.g., politics, religion, law) based on strict collection rules.
History
- Auxiliary Sciences of History
- General Works
- Geography, Anthropology, Recreation
- History of the Americas
- World History
No fiction
- Language and Literature
No spirituality
- Philosophy, Psychology, Religion
No politics
- Political Science
No psychological profiling
- Social Sciences
No medical advice
- Medicine
Other rules
- Law
- Military Science
- Naval Science
Send us a shelf. We’ll send back the catalogue.
The first step is a free classification trial on a sample of your collection. Write to us with a few words about it: what it holds, roughly how many books, and in which languages.