ZF2 Hidden inputs in form visible in source code

Is there a way to make hidden inputs in form become invisible in Source Code? I am using Zend Framework 2 and I need to send some form by POST and data in that form are hidden - I set them in Controller and left button the only visible thing becouse I don't want anyone see what is inside form, but still - if you check Source Code you'll see whole form. So, do you know how to prevent peeking into my data?