The goal of a non-repudiation service is to generate, collect, maintain, make available and verify evi­dence concerning a claimed event or action in order to re­solve dis­putes about the occurrence or non occurrence of the event or action. 
Non-repudiation services establish evidence; evidence es­tablishes accountability regarding a particular event or action. The entity responsible for the action, or associated with the event, with regard to which evi­dence is generated, is known as the evidence subject.
This part of ISO/IEC 13888 serves as a general model for subsequent parts specifying non-repudia­tion mechanisms using cryptographic techniques. ISO/IEC 13888 provides non-repudiation mechanisms for the following phases of non-repudiation:

— evidence generation;

— evidence transfer, storage and retrieval; and

— evidence verification.

Source: https://www.iso.org/obp/ui/#iso:std:iso-iec:13888:-1:ed-3:v1:en