has clause No restrictions on derivatives Source code available Platform unrestricted Number of installations unrestricted Number of users unrestricted Time for use unrestricted Usage unrestricted Distribution unrestricted License without restrictions on derivatives GNU Project Free License Type Attribution required Vendor-specific License ALFRED Copyright https://alfred.med.yale.edu/alfred/fullcopyrightpage.asp, accessed 13 July 2016. The ALFRED Copyright is a vendor-specific license which states that the resource is freely available to the scientific community for statistical analysis, the only condition being that attribution is required. Allyson Lister The ALlele FREquency Database Copyright