How to Remove Stolen Test Series, DPPs, and Class Notes from Telegram

While video lectures are the most visible form of course content, proprietary PDF study materials—such as Daily Practice Problems (DPPs), mock test series, handwritten class notes, and solution keys—are equally valuable. Because PDF files are lightweight, they spread virally across Telegram channels within minutes of release.

Challenges in Protecting Educational PDFs

PDF documents present unique anti-piracy challenges:

• Files can be instantly saved to local devices and re-forwarded without restriction.
• Pirates strip metadata and cover pages to hide original institute branding.
• OCR tools allow pirates to extract raw text and re-format test series into new documents.

Automated PDF Fingerprinting & Removal

PiracyBlock combats PDF piracy through document hashing and automated channel enforcement:

1. Perceptual Document Hashing: Generating unique digital fingerprints for every page of proprietary PDF material.
2. Automated Directory Indexing: Scanning Telegram message attachments for matching document hashes and title keywords.
3. Bulk Channel Takedowns: Submitting statutory copyright filings that purge non-compliant PDF files and ban host channels.