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@Greta wrote:

How can I learn to use Bullzip + password?

How can I learn to use ProSeries secure PDF?

 

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Bullzip is a free program you can download.  You can open any PDF and then choose to Print to Bullzip (bullzip shows up as a printer choice in the list of printers), when the bullzip screen opens, you go to Security and enter a password for the file, then save it.  It does have 2 password boxes, I think it says User and Owner (I don't know which does what, I just enter the same password in both boxes).