Forming and maintaining a multi-source multi-tenant data repository on behalf of multiple tenants. Information in the multi-source multi-tenant data repository is received from multiple sources. Different sources and different data quality enhancement processes may yield different values for attributes of the same referred entity. Information in the multi-source multi-tenant data repository is tagged with annotations documenting the sources of the information, and any data quality processing actions applied to it. Tenants of the multi-source multi-tenant data repository have entitlement to values from some sources and to the results of some quality enhancement processes. Aspects of the method maintain this entitlement information; employ evolutionarily tracked source data tags; receive requests for information, locate the requested information, apply any sourcing preference, enforce entitlements and return entitled values to the requester. An outsourced reference data utility is one context where such a multi-source multi-tenant data repository is useful.