Privacy by design
This policy applies to the CBSE Study Notes portal at learning.techvm.in/ai-cs/, published by VM Technologies. It sits alongside the techvm.in privacy policy.
On this page
What we collect
The minimum needed to run the site, prevent abuse, and protect copyright:
- •session cookie (cbse_sid) — anonymous UUID. ttl: 30d. Only set on accept.
- •consent cookie (cbse_consent) — stores your accept/decline. ttl: 180d.
- •hashed IP — SHA-256 salted; only first 10 chars of the hash are stored. The real IP cannot be recovered.
- •request timestamp + User-Agent.
- •Referer header — previous page URL, if your browser sends it.
What we do NOT collect
- name, email, address, phone
- login / account — you stay anonymous
- location beyond coarse IP hash
- microphone / camera / clipboard / sensors
- third-party analytics (GA, Pixel, etc.)
- advertising networks
Why we collect it
- •anti-piracy watermark — each chapter view stamps your 8-char session ID + IP hash. If a screenshot leaks, we can match the stamp to the log to find when.
- •rate-limiting — more than 120 req/min from the same IP hash is refused to stop bulk scraping.
- •basic analytics — total chapter views per day. No individual profiles.
How long we keep it
| key | ttl |
|---|---|
| session cookie | 30 days · auto-expired by browser |
| consent cookie | 180 days |
| visit logs | rotated at 5 MB · purged after 90 days |
Who we share it with
// nobody.
Hosted on a server operated by VM Technologies. We do not sell, rent, lease or disclose logs to any third party.
exception: a legally-binding court order — complied with under Indian law (IT Act 2000 · DPDP Act 2023).
Third-party resources
The site loads two external resources — for styling & fonts only:
- •fonts.googleapis.com + fonts.gstatic.com — Google Fonts may log your IP for font delivery.
// No scripts · pixels · analytic tags from any other domain.
Cookies banner
On your first visit a consent banner asks you to Accept or Decline cookies.
30-day session cookie is set · small watermark stamp shown on every chapter.
no persistent cookie · temporary session ID per page-load · vanishes on tab-close.
// Reset any time by clearing cookies for this site.
Your rights
Under India's DPDP Act 2023 and similar regulations you may:
- •request access to data tied to your session ID
- •request deletion of your session log entries
- •withdraw consent at any time by clearing cookies
Email support@techvm.in or mr.vivekmaheshwari@gmail.com with your 8-character session ID (bottom-right of every page).
Children's privacy
Aimed at CBSE students (typically 14 – 18 years). We collect no personal information from children. The hashed session ID contains zero personally-identifying data.
Copyright
All curriculum content is © CBSE / NCERT / PSSCIVE.
Our compilation layout and original commentary are © 2026 VM Technologies · compiled by Vivek Maheshwari (MCA).
Offered free of cost for non-commercial classroom study. Commercial re-distribution prohibited. Attribution required on any derivative work.
Security
- HTTPS encryption in transit
- salted SHA-256 IP hashes
- Content-Security-Policy headers
- rate-limiting on API endpoints
- no passwords stored (no login)
- minimal attack surface
// No system is 100% secure, but we keep the surface minimal.
Changes to this policy
We may update this page from time to time. The Last updated date at the top changes when we do. Material changes are announced on the home page for 30 days.
Contact
Questions? Concerns? Takedown requests?