Our legal documents
Click a document to learn how we protect you and your child's privacy.
Privacy policy
How we collect, store and protect your personal data under GDPR.
GDPR compliantPrivacy by designStorage in Sweden
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Terms of use
Rules and guidelines for using Lydia Math safely and effectively.
Usage rulesBillingLiability
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Fair use (AI)
Policy for reasonable AI use — technical limits, plans and misuse.
Unlimited in normal useFair useB2C & schools
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GDPR & DPIA
Impact assessment and risk analysis for data protection under GDPR Article 35.
Risk assessmentSafeguardsReview
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AI transparency
Full openness about how we use AI and what data is processed.
OpenAI GPT-4oSanitisationZero PII
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DPA agreement
Data processing agreement with our subprocessors under GDPR Art. 28.
ProcessorsStorage in SwedenSecurity
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Our privacy principles
Six core principles that govern all our data processing
Alias system
Real names are never stored
Storage in Sweden
All data is stored in Sweden
Encryption
TLS 1.3 + Fernet encryption in the database
Zero PII to AI
OpenAI never receives personal data
Data minimisation
We collect only what's necessary
Right to erasure
Deletion within 30 days on request
Questions about our policies?
We always respond within 48 hours to questions about data protection and privacy. Contact us via:
For data protection officer (DPO):
Last updated: December 2025 · All documents are GDPR compliant