这是一家私人公司。

Zhè shì yì jiā sīrén gōngsī.

This is a private company.

这是私人领域，不方便他人进入。

Zhè shì sīrén lǐngyù, bù fāngbiàn tārén jìnrù.

This is a private area, it's not convenient for others to enter.

我希望保护私人信息的安全。

Wǒ xīwàng bǎohù sīrén xìnxī de ānquán.

I want to protect the security of personal information.