https://en.wikipedia.org/wiki/White_Christmas_(Black_Mirror)
Netflix link: https://www.netflix.com/watch/80073158
Worth a watch, and the series is not chronological so no worries about prior knowledge.
Imagine the death penalty was replaced by a simple "ban" from everybody else's perception. Instead of being put to death, you just appear as an outline filled with static and your voice appears as garbled noise.
Alternatively, imagine "parental controls" for a child's perception that automatically filters out "unsafe" content like sex, violence, hobos, hookers and hate speech.
Or imagine altering a soldier's perception to make enemy combatants appear less human so empathy doesn't get in the way of a clean kill.
In fact the parental controls idea is literally this: http://j.aufbix.org/plif/archive/wc161.gif and I'm pretty sure the soldier one was taken from an episode of Outer Limits or Twilight Zone.
E.g. an image-upload site could answer requests for deletion on privacy grounds not by taking the whole image down, but by obscuring only parts of the image.
Or imagine you're taking a selfie in a crowded place and don't want all those other people diverting attention away from you.
Basically, this could be used whenever someone might go for manually painting over parts of an image to remove content. Something similar for screenshots of conversations might be useful as well.