sunshine law 
noun US
A law requiring certain proceedings of governmental agencies to be open or available to the public.The people of Taiwan had high expectations about the disclosure law, often called the ‘sunshine law.’...
- Nor have any criteria been established for withholding and protecting the information,’ he says, referring both to federal and state governments, which have sunshine laws requiring public disclosure.
- Board members, in particular, view sunshine laws as having enhanced public confidence in the work of their boards.