The Regulation of Investigatory Powers Act 2000 (RIPA) is UK legislation that provides a legal framework for public authorities, like local councils, to conduct surveillance and acquire communications data while respecting human rights, especially Article 8 of the Human Rights Act. It regulates covert methods like directed surveillance, intrusive surveillance, and the use of informants (Covert Human Intelligence Sources or CHIS). RIPA ensures these powers are used only for specific purposes (like preventing serious crime), require proper authorization, and are proportionate, with judicial oversight.