868485 sample

Security/troubleshooting/.NET/ConsoleApp1.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp1", "ConsoleApp1\ConsoleApp1.csproj", "{F791E0B1-C642-4323-80E3-6194633CEFFE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F791E0B1-C642-4323-80E3-6194633CEFFE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F791E0B1-C642-4323-80E3-6194633CEFFE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F791E0B1-C642-4323-80E3-6194633CEFFE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F791E0B1-C642-4323-80E3-6194633CEFFE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F9DF932F-EB48-4DE6-A052-C05C40E70DAF}
+	EndGlobalSection
+EndGlobal

Security/troubleshooting/.NET/ConsoleApp1/ConsoleApp1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="24.1.47" />
+  </ItemGroup>
+
+</Project>

Security/troubleshooting/.NET/ConsoleApp1/Program.cs

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+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Security;
+using System.Security.Cryptography;
+
+// Open a FileStream for reading the PDF file.
+FileStream fileStream = new FileStream("OwnerPasswordOnly.pdf", FileMode.Open, FileAccess.Read);
+// Load the PDF document from the FileStream with the specified owner password.
+PdfLoadedDocument loadedDocument = new PdfLoadedDocument(fileStream, "12345");
+// Access the security settings of the loaded PDF document.
+PdfSecurity security = loadedDocument.Security;
+// Disable incremental update for the file structure.
+loadedDocument.FileStructure.IncrementalUpdate = false;
+// Set specific permissions for a PDF document.
+loadedDocument.Security.Permissions = PdfPermissionsFlags.EditAnnotations | PdfPermissionsFlags.AssembleDocument;
+// Set the encryption algorithm to AES for the document security.
+security.Algorithm = PdfEncryptionAlgorithm.AES;
+// Set the encryption key size to 256 Bit.
+security.KeySize = PdfEncryptionKeySize.Key256Bit;
+// Create a MemoryStream to store the modified PDF document.
+MemoryStream stream = new MemoryStream();
+// Save the modified PDF document to the MemoryStream.
+loadedDocument.Save(stream);
+// Close the loaded PDF document.
+loadedDocument.Close(true);
+// Write the contents of the MemoryStream.
+File.WriteAllBytes("output.pdf", stream.ToArray());
+