Permission changes with rsync

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Dear security team,
I just discovered, that rsync to an encrypted filesystem seem to change owners 
and groups on some files. 

I used "rsync -av" from source to target. (O.k., I missed to 
add --numeric-ids, which resulted in getting some files with numeric owners), 
But other files on the target got wrong owners or groups ! So, this should 
not happen, IMO !

I still have the source available on another host. Is there a way, to correct 
all owners ansd groups at the target without changing the files ?

I tried "rsync -rog --existing --ignore-existing" with no sucess.

Tahbk you very much for your help !

Regards

Hans