1) go to https://www.adobe.com/uk/acrobat/online/password-protect-pdf.html
2) upload a document like so as shown below.
2.1 )
2.2 ) once a pdf is uploaded it will ask you to create a password and confirm it this will enable the PDF to be Encrypted with the password.
3) the document will download if it asks to create a account to download the PDF documents i would say use a work or school email address to tie this down to as these emails are managed rather than a personnel email
4) then test it with opening and it should ask for a password like the below.
Congratulations this PDF is now protected.
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