An extension of the media transfer protocol (MTP) may enable marking an object by specifying information about activity pertaining to the object via an object property. The object property information may be communicated to and/or from a device that supports MTP communications. Object properties may comprise timestamps corresponding to when an object is received, generated and/or accessed or information regarding what activity was performed on the object, who or what entity initiated or executed the activity and/or a history of the activity. Object property information based on a corresponding ObjectPropDesc dataset may be communicated between devices during initiation of communication or via a response to a request such as a GetObjectPropDesc or GetObjectPropValue operation. Information about activity pertaining to the object may be logged and/or audited based on the object properties.