javascript - disable screen capture of specific parts of a webpage

Recently, I've come across certain web pages that have a unique feature preventing screen capture of specific regions. When attempting to take a screenshot using Chrome, some areas that are visible on the live page appear as black frames in the captured image. Surprisingly, Firefox does not exhibit this behavior and screenshots are taken normally without any issues.

An example of a site with this functionality is Netflix. Trying to use the "print screen" key while watching a movie on Chrome (latest update) on a Windows 11 desktop PC results in capturing video controls but showing only a black frame instead of the actual video content.

I'm curious about what kind of JavaScript functionality or API enables this interesting feature?

javascriptgoogle-chromewebscreenshot

Answer №1

Limiting screen capture is known as "Digital Rights Management" from the perspective of a vendor, while for users it may be more like "Enduser Device Control".

This relates to the Video Playback Pipeline rather than JavaScript itself. JavaScript primarily facilitates key exchange to allow local video decryption. Depending on your system's properties, the video quality can be restricted by the provider. Browsers typically only receive SD quality videos. Here's a helpful JS snippet to list the supported CDMs in your browser.

In terms of preventing screenshots, if it's not integrated into the OS, a custom implementation like this (code found here) may be used, though it won't block all screenshot possibilities. For Chrome, disabling hardware acceleration may enable screenshots.

While content cannot be completely secured against recording through the analog hole, video providers often add user-specific watermarks to prevent distribution of such recordings.

If you're considering DRM implementation, check out this simple scheme to set up yourself or contact one of the authorized Widevine partners for L1 hardware level solutions.

If you'd like to learn more about DRM on Android, there are well-documented resources and diagrams available:

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