Secure Edit Controls KeePass supports security-enhanced edit controls.

KeePass was the first password manager featuring secure edit controls. The edit controls used in KeePass are resistant to password revealers and password control spies. Additionally, the entered passwords are protected against memory dumping attacks: the passwords aren't even visible in the process memory space of KeePass!

KeePass uses secure edit controls only when the hiding behind asterisks option is turned on! If you show the passwords in plaintext, they won't be protected (secure edit controls are just disabled then, replaced by standard Windows edit controls).