I have a tax document that was emailed to me as a PDF document that is encrypted. The email was sent in 2011 ( around February) and I have the passowrd for the document. However; when I try to open the document today I am told the passowrd is incorrect. I have verified the password with the person who sent the document and it is correct. I am currently using Reader 9.0. I really need this document. Can anyone help me?