Click Save. The file will be automatically protected. Step 3. To Lock and Unlock PDFs Go to the “Protect” tab and choose block this file or unlock this file. If desired, also choose the block files from this collection‥ and unlock files from this collection‥ options. For each file type choose the block or unlock buttons. Click the block files from this collection‥ button, and select the folder containing the file you wish to lock. Click the unlock files from this collection‥ button; and select the folder containing the file that you wish to unlock. How to Encrypt or Decrypt PDF Files There are two steps to encrypt/decrypt PDF document. Open a PDF file in Adobe Acrobat and choose file ‐ > print. Select Format > Document and then click the encrypt Document‥ button. Note that when using PDF security the password you've entered must precede the name of the document to be encrypted. Step 1. Encrypt PDF into Word or PDF Go to the ‐Options‥ tab. Click the encrypt in PDF button. A new window will appear to display the options. Click the save As‥ button. Save the file as a PDF with the name of your choosing. Note: If you don't want any security of your files, you can also choose “Save as plain text” where you can simply paste the name of the file without password. Step 2. Decrypt PDF into Word or PDF Go to the ‐Options‥ tab. Select the decrypt PDF button. It opens a new window containing a list of files to decrypt or decrypt, and an option to select the appropriate method to decrypt the file into a Word or PDF document. Click the ‐Decrypt‥ button to select any of the options. How to Open or Create a Backup of Your PDFs Step 1. Create a Backup Go to the save As‥ on a PDF file. Click ‥Backup‥. Click ‐Restore‥ to begin the process. If you wish to restore the document again at a later date, click the ‐Restore‥ button. Step 2.