Prepare a Distribution Copy
Prepare a separate distribution copy with an explicit removal list: speaker notes, comments, author/custom metadata and the VBA project. Add a visual watermark and a password-protected PDF. The synthetic original stays unchanged. This is not forensic sanitization: hyperlinks, embedded files, hidden objects and other properties require their own review.
Inputs and execution
Download the complete project, including its original inputs, all source and pinned dependencies. The projects were tested on Windows x64 with Arial and the .NET SDK8.0.427 pinned in global.json. Set ASPOSE_LICENSE_PATH to your license file; unrestricted content checks require a valid license. See licensing. No PowerPoint installation is required.
dotnet run --project Example.csproj --configuration Release
The program generates its own original presentation/template fixture. JSON inputs, when present, are included in the download. All output files are separate from those inputs.
Complete project source
using System;
using System.IO;
using System.Linq;
using System.Net;
using System.Drawing;
using System.Security.Cryptography;
using System.Text.Json;
using Aspose.Slides;
using Aspose.Slides.Charts;
using Aspose.Slides.Export;
using Aspose.Slides.Vba;
internal static class Program
{
private static void Main()
{
var path = Environment.GetEnvironmentVariable("ASPOSE_LICENSE_PATH");
if (!string.IsNullOrWhiteSpace(path)) new License().SetLicense(path);
using (var input = Deck("Quarterly update", "Public summary"))
{
input.DocumentProperties.Author = "Example internal author"; input.DocumentProperties.SetCustomPropertyValue("ReviewStatus", "Draft");
input.Slides[0].NotesSlideManager.AddNotesSlide().NotesTextFrame.Text = "Private example note";
var author = input.CommentAuthors.AddAuthor("Example reviewer", "ER");
author.Comments.AddComment("Example review", input.Slides[0], new PointF(10, 10), DateTime.UtcNow);
input.VbaProject = new VbaProject();
input.VbaProject.Modules.AddEmptyModule("SampleModule").SourceCode = "Sub Example()\nEnd Sub";
input.Save("original.pptm", SaveFormat.Pptm);
}
string original = Hash("original.pptm");
using var copy = new Presentation("original.pptm");
foreach (var slide in copy.Slides)
{
if (slide.NotesSlideManager.NotesSlide != null) slide.NotesSlideManager.RemoveNotesSlide();
Label(slide, "DISTRIBUTION COPY", "DistributionWatermark", 520, 450, 400, 55);
}
foreach (var reviewer in copy.CommentAuthors) reviewer.Comments.Clear();
copy.CommentAuthors.Clear(); copy.VbaProject = null;
copy.DocumentProperties.Author = ""; copy.DocumentProperties.ClearCustomProperties();
copy.Save("distribution.pptx", SaveFormat.Pptx);
string password = Environment.GetEnvironmentVariable("OUTPUT_PDF_PASSWORD") ?? "demonstration-only";
copy.Save("distribution.pdf", SaveFormat.Pdf, new PdfOptions { Password = password });
using var reopened = new Presentation("distribution.pptx");
Require(reopened.VbaProject == null && reopened.CommentAuthors.Count == 0 && reopened.DocumentProperties.CountOfCustomProperties == 0, "Selected removals failed.");
Require(reopened.Slides.All(s => s.NotesSlideManager.NotesSlide == null), "Notes remain.");
Require(Hash("original.pptm") == original, "Original was overwritten.");
Preview(reopened, "preview.png");
Report(new { notes_removed = true, comments_removed = true, macros_removed = true, custom_properties_removed = true, input_preserved = true });
}
private static Presentation Deck(params string[] titles)
{
var deck = new Presentation();
deck.SlideSize.SetSize(960, 540, SlideSizeScaleType.DoNotScale);
var layout = deck.LayoutSlides.GetByType(SlideLayoutType.Blank);
for (int i = 0; i < titles.Length; i++)
{
var slide = i == 0 ? deck.Slides[0] : deck.Slides.AddEmptySlide(layout);
Label(slide, titles[i], "Title", 40, 30, 880, 80);
}
return deck;
}
private static IAutoShape Label(ISlide slide, string value, string name, float x, float y, float w, float h)
{
var shape = slide.Shapes.AddAutoShape(ShapeType.Rectangle, x, y, w, h);
shape.Name = name;
shape.FillFormat.FillType = FillType.Solid;
shape.FillFormat.SolidFillColor.Color = Color.AliceBlue;
shape.LineFormat.FillFormat.FillType = FillType.NoFill;
shape.TextFrame.Text = value;
shape.TextFrame.TextFrameFormat.AutofitType = TextAutofitType.Normal;
foreach (var paragraph in shape.TextFrame.Paragraphs)
foreach (var portion in paragraph.Portions)
{
portion.PortionFormat.FontHeight = 24;
portion.PortionFormat.LatinFont = new FontData("Arial");
portion.PortionFormat.FillFormat.FillType = FillType.Solid;
portion.PortionFormat.FillFormat.SolidFillColor.Color = Color.Black;
}
return shape;
}
private static string Text(ISlide slide) => string.Join(" ", slide.Shapes.OfType<IAutoShape>().Select(s => s.TextFrame?.Text));
private static string Hash(string path) => Convert.ToHexString(SHA256.HashData(File.ReadAllBytes(path)));
private static void Require(bool value, string message) { if (!value) throw new InvalidOperationException(message); }
private static void Preview(Presentation deck, string path)
{
using var image = deck.Slides[0].GetImage(new Size(640, 360));
image.Save(path, Aspose.Slides.ImageFormat.Png);
}
private static void Report(object value)
{
string json = JsonSerializer.Serialize(value, new JsonSerializerOptions { WriteIndented = true });
File.WriteAllText("result.json", json); Console.WriteLine(json);
}
}
Expected outputs
The project writes distribution.pptx, distribution.pdf, preview.png and result.json. Reopen the PPTX/PDF or gallery and inspect its content before adapting the code to a real dataset. Production applications should validate external inputs and choose their own output paths and credentials.
See also Templates and Data, Presentations and Conversion and Rendering.