Sorry, my previous message's content should have been (please ignore what's at its top) : Hi, it seems (in fact I'm sure) there's a bug in changeOwner's behavior: it seems like if you try to change ownership recursively from an object (Folderish) on something you already own, changeOwner returns successfully immediately even if you're not the owner of the complete subtree. AccessControl/Owner.py says: --- CUT --- if old==new: return --- CUT --- which seems to confirm my point. any comment ? Jerome Alet - alet@unice.fr - http://cortex.unice.fr/~jerome Fac de Medecine de Nice http://wwwmed.unice.fr Tel: (+33) 4 93 37 76 30 Fax: (+33) 4 93 53 15 15 28 Avenue de Valombrose - 06107 NICE Cedex 2 - FRANCE