958192 Added proper GitHub sample for Read-only PDF document

Security/Make-a-PDF-read-only/.NET Framework/Make-a-PDF-read-only.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35707.178 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Make-a-PDF-read-only", "Make-a-PDF-read-only\Make-a-PDF-read-only.csproj", "{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Security/Make-a-PDF-read-only/.NET Framework/Make-a-PDF-read-only/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Security/Make-a-PDF-read-only/.NET Framework/Make-a-PDF-read-only/Make-a-PDF-read-only.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{8AEEB7E7-DDA5-400F-AC31-84E2DA573007}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Make_a_PDF_read_only</RootNamespace>
+    <AssemblyName>Make-a-PDF-read-only</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Syncfusion.Compression.Base, Version=29.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Compression.Base.29.2.4\lib\net462\Syncfusion.Compression.Base.dll</HintPath>
+    </Reference>
+    <Reference Include="Syncfusion.Licensing, Version=29.2462.4.0, Culture=neutral, PublicKeyToken=632609b4d040f6b4, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Licensing.29.2.4\lib\net462\Syncfusion.Licensing.dll</HintPath>
+    </Reference>
+    <Reference Include="Syncfusion.Pdf.Base, Version=29.2462.4.0, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89, processorArchitecture=MSIL">
+      <HintPath>..\packages\Syncfusion.Pdf.WinForms.29.2.4\lib\net462\Syncfusion.Pdf.Base.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Security/Make-a-PDF-read-only/.NET Framework/Make-a-PDF-read-only/Program.cs

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+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Security;
+using System.IO;
+
+namespace Make_a_PDF_read_only
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            // Load an existing PDF document from disk
+            PdfLoadedDocument loadedDocument = new PdfLoadedDocument("../../Data/Input.pdf");
+
+            // Access the security settings of the PDF document
+            PdfSecurity security = loadedDocument.Security;
+
+            // Set the encryption algorithm to AES (Advanced Encryption Standard)
+            security.Algorithm = PdfEncryptionAlgorithm.AES;
+
+            // Set the encryption key size to 128-bit for a balance of security and performance
+            security.KeySize = PdfEncryptionKeySize.Key128Bit;
+
+            // Set the owner password (required to enforce permissions)
+            security.OwnerPassword = "Syncfusion";
+
+            //It allows printing and accessibility copy content.
+            security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.AccessibilityCopyContent;
+
+            // Set an optional user password (required to open the PDF)
+            security.UserPassword = "password";
+
+            // Save the updated and secured PDF document to a new file
+            loadedDocument.Save("../../Output/Output.pdf");
+
+            // Close and dispose of the loaded PDF document to release resources
+            loadedDocument.Close(true);
+        }
+    }
+}

Security/Make-a-PDF-read-only/.NET Framework/Make-a-PDF-read-only/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Make-a-PDF-read-only")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Make-a-PDF-read-only")]
+[assembly: AssemblyCopyright("Copyright ©  2025")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("8aeeb7e7-dda5-400f-ac31-84e2da573007")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]