Switch from BullZip to PDF Creator - Encription?

Hello everyone.
I must switch from existing code written for BullZip to PDF Creator but I am really not sure how.
Main problem is adding encryption to PDF Creator so my PDF is protected with password.
This is my code for BullZip with some general variables:

BullZipPDF.SetValue('userpassword','ENCRYPTED');
BullZipPDF.SetValue('userpassword',"Password for PDF");
BullZipPDF.SetValue('keylength','128');
I could use some feedback.
Thanks!