Step-by-Step Guide: Implementing Horizon Screen Capture Protection and Watermarking

Step-by-Step Guide: Implementing Horizon Screen Capture Protection and Watermarking

Technical Implementation: Horizon VDI Content Security

A definitive guide to deploying Screen Capture Protection and Digital Watermarking.

Phase 1: Prerequisites & ADMX Integration

Before configuring policies, you must integrate the VMware Horizon GPO Bundle into your Active Directory environment or local Group Policy editor.

  • Download: Obtain the VMware-Horizon-Extras-Bundle-YYMM-x.x.x.zip from the VMware Customer Connect portal.
  • Import: Copy the vdm_agent.admx file to C:\Windows\PolicyDefinitions and the corresponding .adml file to the en-US sub-folder.
  • Central Store: For domain-wide application, copy these to the SYSVOL PolicyDefinitions folder on your Domain Controller.

Phase 2: Configuring Screen Capture Protection

This policy prevents the Horizon Client window from being captured by screenshots, screen recorders, or remote scraping tools at the OS level.

Policy Location

Computer Configuration > Policies > Administrative Templates > VMware Horizon Agent Configuration > View Video Optimized > Screen Capture Protection

Application Steps

  • Enable the Policy: Set the state to Enabled.
  • Scope: This applies to the Agent (VDI/RDS Host). Once enabled, any client connecting to this agent will have the protection enforced.
  • Expected Behavior: Any attempt to capture the screen via Snipping Tool, PrintScreen, or third-party apps (Zoom/Teams/OBS) will result in a blacked-out window for the Horizon session area.
Pro Tip: Ensure your endpoints are running Windows 10 (1703) or later, as this feature relies on modern Windows Display Affinity APIs.

Phase 3: Deploying Digital Watermarking

Watermarking provides a visual deterrent against "analog leaks" (e.g., photos taken with a smartphone) by overlaying session-specific metadata.

Policy Location

Computer Configuration > Policies > Administrative Templates > VMware Horizon Agent Configuration > Watermark

Configuration Details

  • Enable Watermark: Set to Enabled.
  • Text Content: Use variables to create a dynamic overlay. Common strings include:
    • %USER% - Displays the logged-in username.
    • %IP% - Displays the client's IP address.
    • %TIMESTAMP% - Displays the current connection time.
  • Visual Customization:
    • Opacity: Set between 10-30% to ensure security without distracting the user.
    • Position: Choose from presets (Top-Left, Center, Tile) or custom coordinates.
    • Margin/Font Size: Adjust to ensure the text remains legible across different monitor resolutions.

Phase 4: Verification and Enforcement

After applying the GPOs, follow these steps to confirm the security layers are active:

  1. Run gpupdate /force on the Target VDI or RDS Host.
  2. Log in to the VDI session using the Horizon Client.
  3. Verify that the watermark is visible on the desktop background.
  4. Open the Snipping Tool on the local machine and attempt to capture the VDI window. The resulting image should be blank or black.

Advanced VDI Security Series | Optimized for VMware Horizon 2312+ and Omnissa Environments

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