¿Como saber cuando capturan la pantalla de mi pagina web?

Estoy trabajando en un proyecto con html,laravel,php, javascript, jquery y ajax el problema es que quiero saber cuando le tomen captura de pantalla a mi pagina web y mandar una alerta por correo electrónico.
he buscado información pero no encuentro nada relacionado, entonces no he probado nada.
hay alguna manera de hacerlo o es posible hacerlo?
de ante mano gracias.

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