Downloadable computer software for use by security and compliance departments and personnel to govern and monitor organizational use of third-party artificial intelligence services, namely, software for detecting and masking personally identifiable information in text and in text embedded within images prior to transmission to a language model, and for restoring original values in returned responses; Downloadable browser extension software for detecting sensitive data entered into third-party generative artificial intelligence services and warning users, redacting such data in place, or blocking its transmission according to centrally administered compliance policy; Downloadable software for performing conversion, formatting, encoding, hashing, and inspection operations locally on a computing device without transmitting data to a language model, featuring a keyboard-invoked overlay launcher; Downloadable software for determining and enforcing which third-party artificial intelligence models and language-model endpoints an organization's personnel may use, for generating compliance and usage records of such determinations, and for applying configurable regulatory policy packs to such determinations; Downloadable software for connecting end users to third-party business applications and command-line systems by means of open interoperability protocols; Downloadable software for enforcing an administrator-defined minimum privacy tier that restricts use of third-party language-model endpoints falling below a configured tier; Downloadable software for clipboard history management, screenshot capture with optical character recognition, and local file search