Dynamic access control (DAC) is a security feature that adjusts access control rules in real-time based on changing conditions or risk levels, providing:

1. _Real-time adaptation_: Access control rules change dynamically in response to changing conditions.

2. _Risk-based access control_: Access is granted or denied based on current risk levels.

3. _Context-aware access control_: Access decisions consider user behavior, location, time, and other contextual factors.

4. _Automated policy updates_: Access control policies are updated automatically in response to changing conditions.

5. _Continuous monitoring and evaluation_: User behavior and risk levels are continuously monitored and evaluated.

6. _Granular access control_: Access control rules can be defined at a granular level, based on specific attributes or actions.

7. _Improved security posture_: DAC helps maintain a strong security posture by adapting to changing threats and risks.

8. _Compliance and auditability_: DAC provides a clear and tamper-proof record of access control decisions and policy updates.

Dynamic access control ensures that access control rules are always up-to-date and effective, responding to changing conditions and risk levels in real-time, and providing an additional layer of security and compliance for smart contracts.