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Code: Select all

private bool IsDocumentSecured(int docId)
{
    _viewer.GetDocumentProperty(docId, "Document.Security", out var isSecured);
    return (int) isSecured == 1;
}

Code: Select all

public bool IsDocumentSecured(int docId) {
    // For now we assume the document is secured if the Delete Page operation is not granted.
    // We asked a forum question here that might surface a better approach.
    // https://forum.pdf-xchange.com/viewtopic.php?f=36&t=30839&p=123742#p123742
    return !IsOperationGranted(docId, ObjectIdentifier.Page, OperationIdentifier.Delete);
}

public bool IsOperationGranted(int documentId, ObjectIdentifier objectId, OperationIdentifier operationId) {
    var dataIn = new object[] {
        (int) objectId,
        (int) operationId
    };

    _viewer.DoDocumentVerb(documentId, null, "IsOperationGranted", dataIn, out var isGranted);
    return (int) isGranted == 1;
}