PNG ICO ICNS MORE
Desktop apps
Pixel
Diagona Icons
security, password, Lock
DarkGray
16x16
Splashyfish
Lock, modernist, Folder
DeepSkyBlue
Unlocked, large, Lock
Peru
locked, Lock, large
Lock, locked
SandyBrown
Lock, Unlocked
Smooth
KDE Crystal Diamond
File, locked, secure
Snow
128x128
Lock
Black
22x22