pdf security properties readonly

[DigitallHealth]

We recently upgraded from a very old version of Spire.pdf to the latest one and now run into an issue that we cannot set securityparams anymore.
They all seem to be read only.

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       //
        // Summary:
        //     Gets the owner password.
        public string OwnerPassword { get; }
        //
        // Summary:
        //     Gets the user password.
        public string UserPassword { get; }
        //
        // Summary:
        //     Indicate whether this pdf document was encrypted originally or not.
        public bool OriginalEncrypt { get; }
        //
        // Summary:
        //     Gets the document's permission flags
        public PdfPermissionsFlags Permissions { get; }
        //
        // Summary:
        //     Gets the size of the key.
        public PdfEncryptionKeySize KeySize { get; }


How do i set a password on my pdf? The tutorial still let you set this properties so that doesn't really help.

[amy.zhao]

Hello Hans,

Thanks for your inquiry.
Please refer to the following code to set pdf security properties.

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            PdfDocument doc = new PdfDocument();
            doc.LoadFromFile(pdffile);
            //Encrypt
            PdfEncryptionKeySize keySize = PdfEncryptionKeySize.Key128Bit;
            string openPassword = "e-iceblue";
            string permissionPassword = "test";
            PdfPermissionsFlags flags = PdfPermissionsFlags.Print | PdfPermissionsFlags.FillFields;
            doc.Security.Encrypt(openPassword, permissionPassword, flags, keySize);

            //Save pdf file.
            doc.SaveToFile("Encryption-result.pdf");
            doc.Close();


Sincerely,
Amy
E-iceblue support team

[DigitallHealth]

Thanks for your quick reply.
The permissionpassword is the same as what in the old version was called OwnerPassword?

[amy.zhao]

Hello Hans,

Yes, it is. Sorry I didn't go into detail about the properties of the new method. Please check out the details below.

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doc.Security.Encrypt(UserPassword/OpenPassword, OwnerPassword/permissionPassword, pdfPermissionsFlags, pdfEncryptionKeySize );

Should you have any questions, please contact me.

Sincerely,
Amy
E-iceblue support team