There is a need for refining data security and privacy protection in virtual reality systems which are interactive, creative and dynamic, i.e. where at run-time mutually interactive objects can be added or removed in different contexts while their behavior can be modified. In virtual worlds of this kind, operations on particular objects either should or shouldn’t be allowed to users playing different roles with respect to inter-object interactions. In the VR-PR method presented in this chapter, where VR-PR stands for “Virtual Reality–Privilege Representation”, privileges are represented by pairs, each comprising an object and a meta-operation. Meta-operations are induced automatically from possible object interactions, i.e. generated using automatic analysis of the object method call graphs. Meta-operations reflect the method call scope admitted and are used in the process of creating and modifying privileges, which in turn is controlled by a validation mechanism. Expressive and flexible, privileges based on meta-operations are consistent with a set of objects composing a virtual world, as well as with the interactions between those objects, both interactions and objects permanently evolving. In this chapter it is shown in a series of use cases how the VR-PR approach can be applied to various types of object-oriented virtual worlds. The examples are followed by a broader discussion of the privilege lifecycle in the same virtual environment.
