I have been using the 'Nova PDF Professional' software from a long time you just have to download and then install it and then you just have to follow the below steps:
* After installing it just Open the document that you are willing to convert in to PDF and protect it as well and after that just open the print dialog box (CTRL + P) and then select novaPDF Pro in the printer section.
* Then just Click on the Properties and then you will get a 'novaPDF Pro Properties' dialog box.
* Now in the dialog box just click on the'security' tab and select the option of encryption form low level to High Level Encryption and then enter the password and you can also give a sign in the checklist and then you can modify document content.
Just check it out and see if you find it usable for you.
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