Initializes a new instance of the PdfEncryptionOptions class.
public PdfEncryptionOptions(string? userPassword, string? ownerPassword)
The password that opens the document with Permissions; null or empty opens it without a password.
The password that opens the document with every permission; null or empty for the user password.
ISO 32000-2 §7.6.4.1, §7.6.4.4.2 (Algorithm 3 step a).