Improve Security into Collaboration and Sharing
Provide extra security when sharing a sheet. It is very risky for an editor to be able to copy a spreadsheet or share with other people without the owner permission. Only the owner must have that option unless provided to certain people.
The person that can edit must only be able to edit. Owner must have a list what the editor can and can't do. Example Print, download, Copy in sheet, Share to other people etc.