Owner root gets "Operation not permitted" on chmod and setfacl

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I can't figure this riddle out. su as "root" - .htaccess is owned by "root". But can neither chmod not setfacl. File is read-only to me (can't even rename it). I can create an .htaccess2 file in that same directory and manipulate it freely.

[root@mgs-11 BadgleyMischka]# ls -la --group-directories-first --lcontext .htaccess
-rw-r--r--. 1 unconfined_u:object_r:httpd_sys_content_t:s0 root root 219 Mar  1  2013 .htaccess

[root@mgs-11 BadgleyMischka]# getfacl .htaccess
# file: .htaccess
# owner: root
# group: root
user::rw-
group::r--
other::r--

[root@mgs-11 BadgleyMischka]# chmod 777 .htaccess
chmod: changing permissions of `.htaccess': Operation not permitted

[root@mgs-11 BadgleyMischka]# setfacl  -m g:Site_Developers:rwx .htaccess
setfacl: .htaccess: Operation not permitted
AS

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