Statically enforcing privacy policies in MPC applications can present certain challenges or limitations. One potential challenge is ensuring that the static enforcement does not inadvertently leak private information through control flow channels or unintended side effects. Additionally, defining and implementing comprehensive privacy policies upfront may require a deep understanding of the application's requirements and potential security risks. There could also be difficulties in adapting or modifying existing programs to comply with new or updated privacy policies without introducing vulnerabilities or compromising security measures.
Furthermore, statically enforcing privacy policies may limit the flexibility and adaptability of MPC applications when faced with evolving regulatory requirements or changing business needs. It could also introduce complexities in managing different levels of access control and authorization within the application logic while maintaining efficient computation over private data.