Directory Permissions - Why Authenticated Users?

[Norwood]

Sometimes when I move directories the resulting directory needs to be modified under the security tab to add the "Authenticated Users" user in order to remove the lock icon.

I've verified that I am the owner of the directory...and the other users with access to the directory is "System", My Account and "domain/Administrators".

 

[Norwood]

Just more information to make sure I'm being clear.

If I download a group of wallpapers from Usenet and they go into the "Downloads" library the directory has no lock. Once I move them to the "Walls" library, there is a lock.

If I add "Authenticated Users" to the directory's security tab the lock goes away.

Is this a feature, bug or user error? Any one it might be, how do I stop this behavior?

P.S. This also happens outside of libraries as well, so I don't think it has anything to do with junctions/symlinks.