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Defines the flags that describe a PDF's password protection status. See StandardSecurityHandler#passwordMatches property for details.
None: 0;
The document is not encrypted.
OwnerPasswordEmpty: 2;
The document is encrypted with an empty Owner password.
OwnerPasswordMatch: 8;
The password passed to the PdfDocument.load method matches the document's Owner password.
UserPasswordEmpty: 1;
The document is encrypted with an empty User password.
UserPasswordMatch: 4;
The password passed to the PdfDocument.load method matches the document's User password.