C#/VB.NET: proteger o desproteger un documento de Word

PM> Install-Package Spire.Doc

using Spire.Doc;
    
    namespace PasswordProtectWordDocument
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a Document object
                Document document = new Document();
    
                //Load a Word file
                document.LoadFromFile(@"C:\Users\Administrator\Desktop\test.docx");
    
                //Encrypt the document with a password
                document.Encrypt("open-psd");
    
                //Save the document to another Word file
                document.SaveToFile("Encryption.docx", FileFormat.Docx);
            }
        }
    }

Imports Spire.Doc
    
    Namespace PasswordProtectWordDocument
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a Document object
                Dim document As Document =  New Document()
    
                'Load a Word file
                document.LoadFromFile("C:\Users\Administrator\Desktop\test.docx")
    
                'Encrypt the document with a password
                document.Encrypt("open-psd")
    
                'Save the document to another Word file
                document.SaveToFile("Encryption.docx", FileFormat.Docx)
            End Sub
        End Class
    End Namespace

using Spire.Doc;
    
    namespace ChangeDocumentPermission
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a Document object
                Document document = new Document();
    
                //Load a Word document
                document.LoadFromFile(@"C:\Users\Administrator\Desktop\sample.docx");
    
                //Set the document permission and set the permission password
                document.Protect(ProtectionType.AllowOnlyFormFields, "permission-psd");
    
                //Save the document to another Word file
                document.SaveToFile("Permission.docx");
            }
        }
    }

Imports Spire.Doc
    
    Namespace ChangeDocumentPermission
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a Document object
                Dim document As Document =  New Document()
    
                'Load a Word document
                document.LoadFromFile("C:\Users\Administrator\Desktop\sample.docx")
    
                'Set the document permission and set the permission password
                document.Protect(ProtectionType.AllowOnlyFormFields, "permission-psd")
    
                'Save the document to another Word file
                document.SaveToFile("Permission.docx")
            End Sub
        End Class
    End Namespace

using Spire.Doc;
    
    namespace ProtectSpecificSection
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a Document object
                Document doc = new Document();
    
                //Load a Word document
                doc.LoadFromFile(@"C:\Users\Administrator\Desktop\sample.docx");
    
                //Set editing restriction as "AllowOnlyFormFields"
                doc.Protect(ProtectionType.AllowOnlyFormFields, "permissionPsd");
    
                //Unprotect section 2
                doc.Sections[1].ProtectForm = false;
    
                //Save the document to another Word file
                doc.SaveToFile("ProtectSection.docx");
            }
        }
    }

Imports Spire.Doc
    
    Namespace ProtectSpecificSection
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a Document object
                Document doc  =  New Document()
    
                'Load a Word document
                doc.LoadFromFile("C:\Users\Administrator\Desktop\sample.docx")
    
                'Set editing restriction as " AllowOnlyFormFields"
                doc.Protect(ProtectionType.AllowOnlyFormFields, "permissionPsd")
    
                'Unprotect section 2
                doc.Sections(1).ProtectForm = False
    
                'Save the document to another Word file
                doc.SaveToFile("ProtectSection.docx")
            End Sub
        End Class
    End Namespace

using Spire.Doc;
    
    namespace MarkAsFinal
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a Document object
                Document doc = new Document();
    
                //Load a Word document
                doc.LoadFromFile(@"C:\Users\Administrator\Desktop\sample.docx");
    
                //Get custom document properties
                CustomDocumentProperties customProperties = doc.CustomDocumentProperties;
    
                //Add "_MarkAsFinal" property to the document
                customProperties.Add("_MarkAsFinal", true);
    
                //Save the document to another Word file
                doc.SaveToFile("MarkAsFinal.docx");
            }
        }
    }

Imports Spire.Doc
    
    Namespace MarkAsFinal
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a Document object
                Document doc  =  New Document()
    
                'Load a Word document
                doc.LoadFromFile("C:\Users\Administrator\Desktop\sample.docx")
    
                'Get custom document properties
                Dim customProperties As CustomDocumentProperties =  doc.CustomDocumentProperties
    
                'Add "_MarkAsFinal" property to the document
                customProperties.Add("_MarkAsFinal", True)
    
                'Save the document to another Word file
                doc.SaveToFile("MarkAsFinal.docx")
            End Sub
        End Class
    End Namespace

using Spire.Doc;
    
    namespace RemovePassword
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a Document object
                Document document = new Document();
    
                //Load an encrypted Word document
                document.LoadFromFile(@"C:\Users\Administrator\Desktop\Encryption.docx", FileFormat.Docx, "open-psd");
    
                //Remove encryption
                document.RemoveEncryption();
    
                //Save the document to another Word file
                document.SaveToFile("Decryption.docx", FileFormat.Docx);
            }
        }
    }

Imports Spire.Doc
    
    Namespace RemovePassword
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a Document object
                Dim document As Document =  New Document()
    
                'Load an encrypted Word document
                document.LoadFromFile("C:\Users\Administrator\Desktop\Encryption.docx", FileFormat.Docx, "open-psd")
    
                'Remove encryption
                document.RemoveEncryption()
    
                'Save the document to another Word file
                document.SaveToFile("Decryption.docx", FileFormat.Docx)
            End Sub
        End Class
    End Namespace