Encrypted PDF files

You could encrypt, unencrypted pdf files using
this tool, QPDF. For sensitive data if you want to send a copy
via facebook or emails. A prompt for password will appear everytime someone trying to open it
I tried in some android devices pc it all works. all supported that built in library for encryption
sample qpdf usage:
qpdf --encrypt mypassword 256 -- stateaccount.unencrypt.pdf encrypted.stateaccout.pdf