With PDF creator you can also Encrypt PDFs and protect them from being opened with up to l28-bit encryption. To do this, click on Printer > Options and go to the formats drop down button and click on PDF format. In the security tab, check the Use security box. Choose the encryption method and encryption level- you have a choice of 40-bit (low) and l28-bit (high). After this, you can set various permissions such as disallowing only printing, modification, copying, or all of them. Check the 'Password to open document box'. Click save when done.