Changing to level 20 from a higher level
When you change from a higher security level to level 20, special authorities are added to the user profiles. By doing this, the user has, at least, the default special authority for the user class.
When you change to level 20 from a higher security level, the system
adds *ALLOBJ special authority to every user profile. This allows users to
view, change, or delete any object on the system.
Refer to Table 2 to see how special authorities differ between level 20 and higher security levels.