I would like to create or modify the form of password protected pages. My problem is that: I need another input from the user. If the user gives the email and the password then he/she can see the protected post.
But I do not know how I should start it. Because I think... I have to rewrite the all password protected functionality, in order to handle the one plus input (the email) next to the password input (which is serviced by the WordPress automaticly)
I found this link: http://codex.wordpress.org/Using_Password_Protection . But here the article does not speak about the plus input fields, how I can add or not to the form.