I'm working on a project and looking for ways to prevent users from capturing content in two specific ways: 1) I want to block screenshots so that when someone tries to take a screenshot, they see a black screen instead of any data. 2) I want to prevent capturing the screen through an external camera, like a phone camera. Ideally, that would also result in a black screen or distorted image. Any suggestions for frameworks or methods to achieve this?
3 Answers
For the screenshot blocking, it's theoretically possible to disable the "PrintScreen" key, but that's not foolproof since there are many other ways to take screenshots. It's also complex if you want it to work across different operating systems, especially in a web application.
Blocking external camera captures is pretty much impossible in a direct way. You can't really detect if someone is filming your screen with their phone. A better approach might be to introduce visual noise—something that a human eye wouldn't notice, but could disrupt photo capture, like flickering or Moire patterns. There’s some research on how to reduce these effects that you could adapt.
Exactly! You can use various techniques to add noise that confuses camera sensors while remaining unseen to the naked eye. Look into what's been published about this.
If your goal is effectively blocking capture, the most reliable option would probably involve a driver that manages and blocks these API calls in a more robust way. Just keep in mind that nothing will stop someone who's really determined to capture the information.
Even with disabling keys, determined users will likely find workarounds. You might need to consider implementing additional measures beyond key blocking.