Constroid is based on the family of UCONABC models as
introduced in It extends the classical notion of access
control and allows for modelling of numerous usage policies.
While it is able to describe classical models such as DAC,
MAC, and RBAC, it also meets the requirements of common DRM systems. With the dimensions of Authori sations, Conditions, and Obligations, it addresses Constroid's need
for expressive policies able to describe how personal data
should be safeguarded against potential misuse.