Overview: this anti project viewer restricts access to certain people by crashing Scratch. It will instantly crash if you are not allowed to view it. --------------------------------------------------------------------------------- How to Make it work: For this to work in your project, click see inside (upper right hand corner), drag the "test" sprite into your backpack, go to the project you want to add it in to, drag the "test" sprite out of the backpack into the sprites section of the editor, and finally, in the "if" blocks, change the "blank" in the (username = blank) to whichever user you want to block from viewing the project.
Free to use in any project as long as you give credit. Make sure you save your project before you add the sprite because it may crash while editing the sprite, not by editing other sprites. I'm not sure if this 100% works but it may lag other people.