In your page template (default page.php), you can add a list of user names as custom fields and check the current user against them.

To get the list of users (as custom fields), use get_post_meta()



To get the current user use:

$current_user = wp_get_current_user();

$id = $current_user->ID;

$user_name = $current_user->user_login;

For example:

$current_user = wp_get_current_user();

$users = get_post_meta(get_the_ID(), 'users', false);

$accepted = false;

if (is_array($users))

{

  foreach ($users as $user)

  {

    if ($current_user->user_login == $user)

    {

      $accepted = true;

    }

  }

}



if (!$accepted)

{

  // stop showing the page

}