Rule of single engine helicopter in built up areas?

Is there any rule that prohibit single engine helicopter fly over built up area? I sometimes saw some websites stated that transportation of passengers in single engine helicopter is also prohibited ?!? is it true?

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��).