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in this tutorial we demonstrate password protecting a pdf document using dynamic pdf coresuite4.net setting password protection and encrypting a pdf can be done with just a few lines of code when using dynamic pdf core suite of course the way it works is when a user password is specified the pdf viewer will require the password in order to open the document dynamic pdf supports the aes 128 security aes 256 security rc-4128 security and the rc-440 security encryption settings note that unless you have specific requirements you should generally not use rc4128 or rc440 as neither are very secure and both will be deprecated in future dynamic pdf course suite versions instead use 128-bit or 256-bit aes encryption in this tutorial we use the aes 256 security encryption setting let's get started open visual studio and create a new project name encryption example select the consoleapplication.net core template name the project encryption example create add the core suite nougat package c-e-t-...