The problem of tree structured data is that it requires different Integrity and confidentiality for different portion of same content. Integrity assurance technique not only applies integrity to received data by user, but also any compromise to data that must be precisely determined. In tree structures each node contains some content and structural relationships between the nodes. Therefore, it considers structural integrity and content integrity. Confidentiality means a user receives only those nodes as well as organized information to user has privilege according to access control policies, wherever one should not infer others information. In this paper we reviewed different techniques related to dissemination of tree structured data that exploits structural properties of tree based data model (such as XML document). The approach is based on notion of encrypted post-order numbers which is based on post-order number properties. It facilitates efficient identification, extraction, distribution of selected content portions.