Temporary work through employment agencies. What are the consequences of leaving the agency for the employer?

I have temporary work through an employment agency. There is a possibility that the company have permanent positions but I have been told that the agency will charge the company if I start to work for them directly. Does any anyone know the rules around this?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).