SeeMeNot

A macOS utility that automatically detects and hides sensitive content during Microsoft Teams screen sharing.

When you start sharing your screen, SeeMeNot takes a one-shot screenshot of every open window (including minimized ones), sends them in parallel to Azure OpenAI GPT-4.1 for privacy analysis, and places dark overlays on any window containing sensitive information — passwords, salary slips, private chats, banking details, medical records, and more.

Switch to a sensitive app during sharing and the overlay appears instantly. Switch away and it disappears. Click the overlay to dismiss it.

How It Works

1. SeeMeNot runs as a menu-bar app (🛡)
2. Detects when Microsoft Teams screen sharing starts (via Quartz window heuristics)
3. Captures all windows in parallel and sends screenshots to Azure OpenAI for classification
4. Flagged windows get a dark overlay visible to screen-sharing viewers
5. Overlays track window position in real time and only appear when the sensitive app is in the foreground
6. Click an overlay to dismiss it — other sensitive windows stay protected

No re-scanning while sharing is active. When you stop and start sharing again, a fresh scan runs.

Requirements

• macOS 12+ (Monterey or later)
• Python 3.11+
• Azure OpenAI endpoint with a GPT-4.1 (or similar vision model) deployment

Setup

cd SeeMeNot
python3.11 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Configure your Azure OpenAI credentials:

cp .env_sample .env
# Edit .env with your real values:
#   AZURE_ENDPOINT=https://your-resource.openai.azure.com/openai/v1/chat/completions
#   AZURE_API_KEY=your-api-key
#   AZURE_DEPLOYMENT=gpt-4.1

Grant macOS permissions:

• Screen Recording: System Settings → Privacy & Security → Screen Recording → enable your terminal
• Accessibility (optional, for Esc key dismiss): System Settings → Privacy & Security → Accessibility

Usage

source .venv/bin/activate
python -m seemenot

Controls

Action	How
Dismiss one overlay	Click on it
Dismiss via keyboard	Press Esc (requires Accessibility permission)
Remove all overlays	Menu bar → Remove All Overlays
Force re-scan	Menu bar → Re-scan Now
Pause/resume	Menu bar → Pause Scanning

Architecture

seemenot/
  app.py              — Menu-bar app, scanner loop, overlay orchestration
  window_capture.py   — Window enumeration + screenshot capture (Quartz)
  privacy_analyzer.py — Response parsing and classification
  connectAzure.py     — Azure OpenAI vision API client
  overlay_manager.py  — Clickable overlay window creation and positioning
  sharing_detector.py — Microsoft Teams screen sharing detection
  config.py           — Settings, prompts, Azure credentials

Limitations

• Relies on heuristics to detect Teams screen sharing — may not work on all Teams versions
• Azure OpenAI calls add latency to the initial scan (typically 5–15 seconds for all windows)
• False positives/negatives are possible — tune the prompt in config.py if needed
• Overlays are per-app: they appear when the sensitive app is frontmost and hide when you switch away