How to Create Readonly Presentation using C#. For more details: https://kb.aspose.com/slides/net/how-to-create-readonly-presentation-using-csharp/

How to Create Readonly Presentation using C#.cs

using System;
using Aspose.Slides;
using Aspose.Slides.Export;

namespace TestSlides
{
    public class ReadonlyPresentation
    {
        public static void ApplyReadOnly()
        {
            String path = @"/Users/KnowledgeBase/TestData/";

            // Setting the license for the product to make the presentation readonly
            License SlidesLicense = new License();
            SlidesLicense.SetLicense(path + "Conholdate.Total.Product.Family.lic");

            // Load the source presentation file to make it readonly
            using (Presentation presSecurity = new Presentation(path + "Source.pptx"))
            {
                // Set the presentation access to readonly
                presSecurity.ProtectionManager.ReadOnlyRecommended = true;

                // Save the readonly presentation on the disk
                presSecurity.Save(path + "SecurePres.pptx", SaveFormat.Pptx);
            }

        }
    }
}