An access permissions management system including a hierarchical access permissions repository including access permissions relating to data elements arranged in a data element hierarchy, wherein some of the data elements have only access permissions which are inherited from ancestral data elements, some of the multiplicity of data elements are prevented from having inherited access permissions and thus have only unique access permissions which are not inherited and some of the data elements are not prevented from having inherited access permissions and have not only inherited access permissions but also unique access permissions which are not inherited, some of which unique access permissions possibly being redundant with inherited access permissions, and an access permissions redundancy prevention engine operative to ascertain which of the unique access permissions are redundant with inherited access permissions and not to store the unique access permissions which are redundant with inherited access permissions in the repository.