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You need to have owner password to unlock these restrictions and make required changes accordingly.

You can open the PDF file easily, but it is available as a Read-Only file with all other restrictions imposed. Also known as Master password, it will lock PDF files from being copied, edited, printed etc.

In addition to user password, the authors also add a layer of protection to their PDF files by securing them with owner password. Now you might be wondering, why PDF is considered as the secure document format? Well, look at the characteristics of this file format, you’ll get all answers to your queries : And the most secure file format to save data online is PDF (portable document format). In today’s digital world, where everything is digitized, we tend to save our crucial documents online too.