how to disable print screen

[MentorBR]

guys, how do i block the use of printscreen in the posts of the members in my forum?
I noticed that when someone uses this feature to post an image, the post is full of letters so the topic bugs.

[yilmaz]

Message Posting Interface Options => Enable Standard Controls
Choose.

[MentorBR]

Originally Posted by yilmaz

Message Posting Interface Options => Enable Standard Controls
Choose.

My settings are already like this.
I want members not to be able to use print screen to send images, as this is bugging the topic.