1. P1 has grant access to healthcare provider H2, so it has granted its read right over R1 to H2. In this operation only P1 actions are involved.
2. P1 has grant access right to healthcare provider H1, so it has granted H1 to grant right over H2. Since, H1 has grant right to H2, H1 can grant its write access to H2 over R1. In this operation, both the healthcare provider H1 and patient P1 permission are required for H2 to obtain write access on record R1.
3. Similarly, the same process can be followed for P2 and H2 to provide new healthcare provider H3 write access on the record R2.
In this scenario, when using the take-grant model there will always be disallowed sharing of rights. There is a limitation with the take-grant model as it can’t
2. P1 has grant access right to healthcare provider H1, so it has granted H1 to grant right over H2. Since, H1 has grant right to H2, H1 can grant its write access to H2 over R1. In this operation, both the healthcare provider H1 and patient P1 permission are required for H2 to obtain write access on record R1.
3. Similarly, the same process can be followed for P2 and H2 to provide new healthcare provider H3 write access on the record R2.
In this scenario, when using the take-grant model there will always be disallowed sharing of rights. There is a limitation with the take-grant model as it can’t