At a glance the reuse of a service and entitlement to those service results have nothing in common. But on the second thought, the more a service gets reused the greater the chance of serving users with different access rights to the service results.
We'll discuss two models of reuse and see which one is more suitable for resolving data visibility tasks.

Service Reuse Models
In the early days of SOA, service reuse was one of the main selling points in pitching the new architecture principle to business clients. It's still a mystery to me why the idea of reuse has worked this time - it's not new to IT or business. Before, object-oriented architecture promised business reuse and component-oriented architecture swore to it. Then IT finally got a great deal of reuse out of standardized API; this helped solve some business problems but failed to provide the promised scale of improvement.