Best Practices for Preventing Unauthorized Document Capture and Access

The Reality

Unfortunately, there's no foolproof technical solution to prevent screenshots. If someone can view a document on their screen, they can potentially capture it through:

• Screenshots
• Phone cameras
• Screen recording software

Practical Limitations

Prevention Through Access Control Rather than trying to block screenshots, focus on:

1. Minimize Exposure: Don't share sensitive documents digitally unless absolutely necessary
2. Control Who Has Access: Use role-based permissions (Managers, Editors, Viewers)
3. Create Audit Trails: Enable access logs so you know who viewed what and when
4. Use Secure Platforms: Store highly sensitive documents in end-to-end encrypted services like Tresorit rather than general cloud drives
5. Implement Data Classification: Classify documents by sensitivity level and apply appropriate security measures

Detection Over Prevention Since you can't fully prevent screenshots, focus on detection:

• Watermark documents with recipient-specific identifiers
• Maintain detailed access logs
• Use platforms that track viewer IP addresses and email verification
• Create clear policies about acceptable use

Technical Controls

Document Watermarking

• Add watermarks to sensitive documents for leak detection
• Tresorit offers watermarking features for shared videos and documents to prevent unauthorized re-sharing

Access Controls & Monitoring

• Use platforms like Tresorit that provide access logs to track who viewed documents
• Enable download tracking to monitor document access
• Implement time-limited access with expiration dates on shared links
• Use download limits (e.g., 5-10 opens) for highly sensitive documents