When I save a document in PDF, then opened at a later date, sometimes also encrypted. What should I change?

I save a document in PDF and xls.  No later than the time when I opened the PDF looks like it's encrypted. I don't know what other information you need to help, so please let me know if you need to correct this situation.  Thank you

Do you have a PDF Reader installed? If so, which one, and the opening of PDF files with this program or other?

Tags: Windows

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