Abstract The accountability of cloud service which provides the cloud users with accountable services applies various technologies such as the compliance of service policy, monitoring and auditing, logging, and others. It ultimately intends to provide trustworthy cloud service by determining who is accountable for various problems happened during data processing and service offering. In this paper, we propose a cloud ecosystem formed from the chain of content and DRM Cloud service in order to offer secure and trust DRM cloud service when providing high value-added content service. Besides this, we analyse the requirements of cloud services for content owners and users and then propose some logging information to be recorded for trace of accountability and a structure of tool for monitoring. Key Words : Cloud computing, Accountability, Digital rights management, Content Service, Monitoring * 이 논문은 2011년도 정부(미래창조과학부)의 재원으로 한국연구재단-차세대정보ㆍ컴퓨팅기술개발사업의 지원을 받아 수행된 연구임(No. 2011-0029927)Received 13 October 2014, Revised 17 November 2014Accepted 20 December 2014Corresponding Author: Sang Uk Shin(Pukyong National University) Email: shinsu@pknu.ac.krⒸ The Society of Digital Policy & Management. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is ISSN: 1738-1916 properly cited.