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Metadata Privacy Risks

Understanding why metadata removal matters for privacy and security.

What is Metadata?

Metadata is "data about data" - hidden information embedded in files that describes when, where, how, and by whom a file was created or modified.

Common Metadata Types

📸 Images (JPEG, PNG)

Metadata Type	Privacy Risk
GPS Coordinates	Reveals exact location where photo was taken
Camera Model	Can identify specific device, linked to owner
Date/Time	Reveals when photo was taken
Software	Shows editing tools used
Thumbnail	May contain original uncropped image

📄 Documents (Word, PDF)

Metadata Type	Privacy Risk
Author	Reveals creator's name/username
Company	Exposes employer information
Last Modified By	Shows who edited the document
Comments	May contain internal notes
Revision History	Can expose previous versions

📊 Spreadsheets (Excel)

Metadata Type	Privacy Risk
Author	Reveals creator identity
Company	Exposes organization
Keywords	May reveal document purpose
Custom Properties	Internal tracking data

📽️ Presentations (PowerPoint)

Metadata Type	Privacy Risk
Author	Creator identity
Title/Subject	May reveal confidential topics
Comments	Presenter notes, internal feedback

Real-World Examples

Case 1: Location Leak via Photo

A journalist shared a photo online. The embedded GPS coordinates revealed their safe house location, putting sources at risk.

Case 2: Internal Document Exposed

A company released a redacted PDF. The author metadata still showed an employee's full name and the legal department.

Case 3: Anonymous Submission Failed

A whistleblower submitted documents "anonymously" but the Word metadata contained their username and computer name.

High-Risk Scenarios

Sharing photos on social media - GPS can reveal home address
Sending documents to clients - Author reveals internal usernames
Publishing reports externally - Revision history may expose drafts
Submitting anonymous tips - Metadata can identify the source
Legal discovery - Metadata is often requested in litigation

What This Tool Removes

Category	Removed Properties
Identity	Author, Last Modified By, Creator
Location	GPS Latitude, Longitude, Altitude
Device	Camera Model, Software, Device ID
Tracking	Comments, Keywords, Custom Properties

Preserved (Intentionally)

Created Date - Often needed for file organization
Modified Date - Required for version tracking
Language - Accessibility purposes

Best Practice

Always scrub metadata before sharing files externally.

# Check what metadata exists
mst read document.pdf

# Remove metadata
mst scrub document.pdf --output ./clean

# Verify removal
mst verify document.pdf ./clean/processed_document.pdf

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