You can edit tracks that you don't own, but you cannot post your changes to remotely owned tracks. Your edits will be overwritten by the version on the server the next time you receive the track or do a global receive. You can use the Track Data filter (see "Track Receive Data Filter"on page 30 of the DigiStudio Guide) protect your edits from being overwritten by the version on the server. You can also duplicate the remotely owned track and edit the copy.