Why I cannot modify the access permissions?

On the Fedora8 OS I issue the follow command:
[root@localhost local]#chmod o-r /usr/local
[root@localhost ~]#chmod o+w /root/rar
Then I check the privilege using GUI tool and I find the access permissions have not been changed.
Why I cannot modify the access permissions as a root user?

1) Is the underlying file system mounted as read-only? Not even root can overcome that.
2) Perhaps the file has been marked as "immutable" by chattr(1)? What does
# lsattr -d /usr/local/ /root/rar
show? Without attributes, should see only dashes ("-").

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