Collection of ETags that must not be matched as a pre-condition for copying the source object
            otherwise returns a PreconditionFailed.
            
 Remarks
 Remarks
            Copies the object if its entity tag (ETag) does not match any of the specified
            tags; otherwise returns a 412 (failed condition).
            Constraints: This header can be used with IfModifiedSince, but cannot
            be used with other conditional copy properties.