How to Check PDF is Comment enabled or not using C#

My only requirement is to find a selected pdf in a folder is Reader enabled or not, more specifically if usage rights are defined in a way that allows people to add annotations (e.g. comments).

I am doing this in windows application. If I click a button, an event is triggered searching a folder for PDF files. This event needs to check whether or not the PDFs in the folder are Reader enabled for comments. If they are, I need to remove the comment usage rights or revert the PDF back to its original version.

My code can only find PDF files in the folder. I don`t know how to check if the selected PDF is comment enabled or not. Please be gentle and suggest solution.

private void button1_Click(object sender, EventArgs e)
{
    {
        string[] filePaths = Directory.GetFiles("D:\\myfolder\\pdffolder");
        List<ListViewItem> files = new List<ListViewItem>();
        foreach (string filePath in filePaths)
        {
            ---need to check comment enabled or not---
        }
    }
}