Abstract: Source data is centralized in a database and derivative data sets are formed from the source data. When it is desired to modify derivative data, the source data can be accessed and modified to form a new derivative data set, instead of modifying the prior data set, such that source data integrity is maintained. Tags are associated with derivative data, which can be embedded in the derivative data or associated with the derivative data as an attached element. Tags identify information such as the server that generated the derivative data, the source data and any tasks or transformations that were applied to the source data to generate the derivative data. Users with assigned access privileges to source data can be given access to a source data repository, whereby a number of users can access the source files and modify derivative data files by changes in the source data file.