692 ITU‐T's Technical Reports and Specifications the individuals, it is essential that the data containing sensitive information should be protected from unauthorized use. Contrastingly, the organizations should provide the privacy data by transferring the data to useful services in smart sustainable cities. In providing the data, preserving privacy at a required level should be prioritized. It has the possibility that the two different data, generated by suitable anonymization process to the required anonymization level, reveal the original plain data. This situation can be harmful in publishing data even if the data is appropriately anonymized. Moreover, the following information is needed from the viewpoint of both original data provider and application servicer using the data. In providing data as open data, this anonymization process is indispensable to maximize the use of private data as rich services. Contents of data Services or applications of smart sustainable cities mainly focuses on contents of data. The data can be separated into two parts: header as an index or tags from the viewpoint of data management and contents. Contents are the main part of data. For the entity providing an application and its user, the type of information included is considered important. The valuable application of the data strongly depends on this information. Ownership of data For the application service provider of the data and its user, the data has to be reliable and used to address pertinent concerns. Data providers have to give the name of the organization in order to add value to the data. In short, the way to authorize the owner of the data is another issue for data services in a smart sustainable city. Generation date/time and expiration of data For the application servicer provider of the data and its user, the date and time for when the data was generated is valuable information to determine the relevance and freshness of the data. In some cases, data analysis in its historical trend or changes is achieved. The date when the data was generated is fundamental information for this analysis. In addition to the information, the expiration date and time is required. Traffic information and market information can be the examples of data that the expiration date and time is indispensable. Update of the contents Some data of smart sustainable city requires continuous updating. Instead of static information, historical information requires to be updated to keep the data fresh. The frequency or interval of this update may influence evaluability of the data. Anonymizer of the data From the application service provider of the data, and its user, the information regarding who or which organization anonymized the data is required to know whether the data is trustworthy and can be used An authorized anonymization servicer provider should anonymize the data for maximizing the value of the anonymized data. Namely, the way to authorize the anonymization servicer is another concerning in data services in smart sustainable cities. Anonymized date/time of data The information of anonymized date/time may not be directly concerned with the applications. However, it is needed from the viewpoint of traceability of data processing. When some privacy pirating attacks occurs, the information becomes a significant source of its detection and prevention.