From my Android application you can download the PDF file that is stored on your SD card, I want to be invisible to the user, so change the file extension, but it does not seem sufficient, so I would like to be able to edit pdf and paste the line into beginning of pdf, so it is unusable if this line is in pdf.
If you could tell me how to open / convert pdf to insert a line to add to the beginning, or some other type of method would be grateful.
Thankss !!
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