I cannot change the author, title, and other properties of a PDF file

[Suzan5FDF]

Hi guys, I cannot change the properties of a PDF file, like author, title, subject, and keywords as all these fields are grayed out. Some of the PDF files I have are filled with information, and some are not. For both cases I am unable to change them. I have considered the possibility that these files are protected by their creators, but the files have no passwords, and I have even tried to create my own PDF using Microsoft Office Word Document and then saved it as a PDF, and even then, though I'm the creator of the file it shows the author with a name I have never seen before and I still cannot change that

[try67]

Correct, Reader can't change those properties. You would need Acrobat to do it, or find a way to do it within the application that's creating the PDF.