We present a reduction from a new logic extending van der Meyden's dynamic logic of permission (DLP) into propositional dynamic logic (PDL), providing a 2EXPTIME decision procedure and showing that all the machinery for PDL can be reused for reasoning about dynamic policies. As a side-effect, we establish that DLP is EXPTIME-complete. The logic we introduce extends the logic DLP so that the policy set can be updated depending on its current value and such an update corresponds to add/delete transitions in the model, showing similarities with van Benthem's sabotage modal logic.
['Stéphane Demri']
A Reduction from DLP to PDL