From : Blog Entry>>ILTA’s Blog Entry
Security – Adobe Acrobat Pro DC To add password security to open a PDF document within Acrobat Open the PDF and click on TOOLS . Click on Protect . The Protect toolbar displays. Click on the Encrypt drop-down. Choose Encrypt with Password . Click Yes to change security if a prompt displays. Select the Require a password to open the document checkbox. Type a password in the Document Open Password field. Click on OK . To restrict [More]