In this disaster recovery system, all operations of managers are recorded in system log, and digital watermark technology is used to ensure authoritativeness, accountability, integrity of the log and avoid that the log is modified unlawfully.

• 采用数字水印日志技术。 系统严格记录管理员的操作日志,并且日志采用数字水印技术保证其权威性、不可否认性和完整性,防止日志被非法修改。