Security in Presentation

28 Sep 2020 / 13 minutes to read

Encrypting with password

You can protect a PowerPoint Presentation by encrypting the document by using a password. This prevents unauthorized users to access or make changes in the Presentation.

The following code example demonstrates how to encrypt a PowerPoint Presentation with password.

c#

//Creates an instance for Presentation

IPresentation presentation = Presentation.Create();

//Adds slide to Presentation

ISlide slide = presentation.Slides.Add(SlideLayoutType.Blank);

//Adds textbox to slide

IShape shape = slide.Shapes.AddTextBox(100, 30, 200, 300);

//Adds a paragraph with text content.

IParagraph paragraph = shape.TextBody.AddParagraph("Password Protected.");

//Protects the file with password

presentation.Encrypt("PASSWORD!@1#$");

//Saves the Presentation

presentation.Save("Sample.pptx");

//Closes the Presentation

presentation.Close();

vb.net

'Creates an instance for Presentation

Dim presentationDocument As IPresentation = Presentation.Create()

'Adds slide to Presentation

Dim slide As ISlide = presentationDocument.Slides.Add(SlideLayoutType.Blank)

'Adds textbox to slide

Dim shape As IShape = slide.Shapes.AddTextBox(100, 30, 200, 300)

'Adds a paragraph with text content.

Dim paragraph As IParagraph = shape.TextBody.AddParagraph("Password Protected.")

'Protects the file with password

presentationDocument.Encrypt("PASSWORD!@1#$")

'Saves the Presentation

presentationDocument.Save("Sample.pptx")

'Closes the Presentation

presentationDocument.Close()

NOTE

PowerPoint Presentation doesn’t support encryption in ASP.NET Core, Blazor and Xamarin.

Decrypting the PowerPoint Presentation

Essential Presentation provides ability to remove the encryption from the PowerPoint Presentation. You can decrypt a PowerPoint Presentation by opening it with the password.

Opening the Encrypted PowerPoint Presentation

The following code example demonstrates opening the encrypted PowerPoint Presentation.

c#

//Opens an existing Presentation from file system and it can be decrypted by using the provided password.

IPresentation presentation = Presentation.Open("Sample.pptx", "PASSWORD!@1#$");

//Saves the Presentation

presentation.Save("Output.pptx");

//Closes the Presentation

presentation.Close();

vb.net

'Opens an existing Presentation from file system and it can be decrypted by using the provided password.

Dim presentationDocument As IPresentation = Presentation.Open("Sample.pptx", "PASSWORD!@1#$")

'Saves the Presentation

presentationDocument.Save("Output.pptx")

'Closes the Presentation

presentationDocument.Close()

Removing the encryption from Presentation

The following code example demonstrates removing the encryption from a PowerPoint Presentation.

c#

//Opens an existing Presentation from file system and it can be decrypted by using the provided password.

IPresentation presentation = Presentation.Open("Sample.pptx", "PASSWORD!@1#$");

//Decrypts the document

presentation.RemoveEncryption();

//Saves the presentation

presentation.Save("Output.pptx");

//Closes the Presentation

presentation.Close();

vb.net

'Opens an existing Presentation from file system and it can be decrypted by using the provided password.

Dim presentationDocument As IPresentation = Presentation.Open("Sample.pptx", "PASSWORD!@1#$")

'Decrypts the document

presentationDocument.RemoveEncryption()

'Saves the Presentation

presentationDocument.Save("Output.pptx")

'Closes the Presentation

presentationDocument.Close()

Write Protection

You can set write protection for a PowerPoint Presentation and remove protection from the write protected PowerPoint presentation.

Protect PowerPoint Presentation

You can protect a PowerPoint Presentation with password to restrict unauthorized editing.

The following code example shows how to set write protection for a PowerPoint Presentation.

c#

//Create a new instance for PowerPoint presentation
IPresentation pptxDoc = Presentation.Create();

//Add the blank slide to the presentation
ISlide slide = pptxDoc.Slides.Add(SlideLayoutType.Blank);

//Add the shape to the slide
IShape shape = slide.Shapes.AddShape(AutoShapeType.BlockArc, 0, 0, 200, 200);

//Add the paragraph to the shape.
IParagraph paragraph = shape.TextBody.AddParagraph("welcome");

//Sets the author name
pptxDoc.BuiltInDocumentProperties.Author = "Syncfusion";

//Set the write protection for presentation instance
pptxDoc.SetWriteProtection("MYPASSWORD");

//Saves the modified cloned PowerPoint presentation
pptxDoc.Save("Sample.pptx");

//Close the presentation instance
pptxDoc.Close();

vb.net

'Create a new instance for PowerPoint presentation
IPresentation pptxDoc = Presentation.Create()

'Add the blank slide to the presentation
ISlide slide = pptxDoc.Slides.Add(SlideLayoutType.Blank)

'Add the shape to the slide
IShape shape = slide.Shapes.AddShape(AutoShapeType.BlockArc, 0, 0, 200, 200)

'Add the paragraph to the shape.
IParagraph paragraph = shape.TextBody.AddParagraph("welcome")

'Sets the author name
pptxDoc.BuiltInDocumentProperties.Author = "Syncfusion"

'Set the write protection for presentation instance
pptxDoc.SetWriteProtection("MYPASSWORD")

'Saves the modified cloned PowerPoint presentation
pptxDoc.Save("Sample.pptx")

'Close the presentation instance
pptxDoc.Close()

uwp

//Create a new instance for PowerPoint presentation
IPresentation pptxDoc = Presentation.Create();

//Add the blank slide to the presentation
ISlide slide = pptxDoc.Slides.Add(SlideLayoutType.Blank);

//Add the shape to the slide
IShape shape = slide.Shapes.AddShape(AutoShapeType.BlockArc, 0, 0, 200, 200);

//Add the paragraph to the shape.
IParagraph paragraph = shape.TextBody.AddParagraph("welcome");

//Sets the author name
pptxDoc.BuiltInDocumentProperties.Author = "Syncfusion";

//Set the write protection for presentation instance
pptxDoc.SetWriteProtection("MYPASSWORD");

//Initializes FileSavePicker
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
savePicker.SuggestedFileName = "Output";
savePicker.FileTypeChoices.Add("PowerPoint Files", new List<string>() { ".pptx" });

//Creates a storage file from FileSavePicker
StorageFile storageFile = await savePicker.PickSaveFileAsync();

//Saves changes to the specified storage file
await pptxDoc.SaveAsync(storageFile);

asp.net core

//Create a new instance for PowerPoint presentation
IPresentation pptxDoc = Presentation.Create();

//Add the blank slide to the presentation
ISlide slide = pptxDoc.Slides.Add(SlideLayoutType.Blank);

//Add the shape to the slide
IShape shape = slide.Shapes.AddShape(AutoShapeType.BlockArc, 0, 0, 200, 200);

//Add the paragraph to the shape.
IParagraph paragraph = shape.TextBody.AddParagraph("welcome");

//Sets the author name
pptxDoc.BuiltInDocumentProperties.Author = "Syncfusion";

//Set the write protection for presentation instance
pptxDoc.SetWriteProtection("MYPASSWORD");

//Save the PowerPoint Presentation as stream
FileStream outputStream = new FileStream("Output.pptx", FileMode.Create);
pptxDoc.Save(outputStream);

//Closes the presentation
pptxDoc.Close();

xamarin

//Create a new instance for PowerPoint presentation
IPresentation pptxDoc = Presentation.Create();

//Add the blank slide to the presentation
ISlide slide = pptxDoc.Slides.Add(SlideLayoutType.Blank);

//Add the shape to the slide
IShape shape = slide.Shapes.AddShape(AutoShapeType.BlockArc, 0, 0, 200, 200);

//Add the paragraph to the shape.
IParagraph paragraph = shape.TextBody.AddParagraph("welcome");

//Sets the author name
pptxDoc.BuiltInDocumentProperties.Author = "Syncfusion";

//Set the write protection for presentation instance
pptxDoc.SetWriteProtection("MYPASSWORD");

//Create new memory stream to save Presentation.
MemoryStream stream = new MemoryStream();

//Save Presentation in stream format.
pptxDoc.Save(stream);

//Close the presentation
pptxDoc.Close();
stream.Position = 0;

//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer presentation/xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
    Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation", stream);
else
    Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation", stream);

Remove Protection

You can check whether a PowerPoint Presentation is write protected and remove protection from the write protected PowerPoint Presentation.

The following code example shows how to remove restriction protection from the write protected PowerPoint Presentation

c#

//Open the PowerPoint presentation
IPresentation pptxDoc = Presentation.Open("Sample.pptx");

//Gets whether the presentation is write Protected. Read - only.
bool writeProtected = pptxDoc.IsWriteProtected;

//Checks whether the presentation is write protected
if (writeProtected)
{
     //Removes the write protection for presentation instance.
     pptxDoc.RemoveWriteProtection();
}

//Saves the modified cloned PowerPoint presentation
pptxDoc.Save("Output.pptx");

//Close the presentation instance
pptxDoc.Close();

vb.net

'Open the PowerPoint presentation
IPresentation pptxDoc = Presentation.Open("Sample.pptx");

'Gets whether the presentation is write Protected. Read - only.
bool writeProtected = pptxDoc.IsWriteProtected;

'Checks whether the presentation is write protected
if (writeProtected)
{
     'Removes the write protection for presentation instance.
     pptxDoc.RemoveWriteProtection();
}

'Saves the modified cloned PowerPoint presentation
pptxDoc.Save("Output.pptx")

'Close the presentation instance
pptxDoc.Close()

uwp

//Instantiates the File Picker
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.SuggestedStartLocation = PickerLocationId.Desktop;
openPicker.FileTypeFilter.Add(".pptx");

//Creates a storage file from FileOpenPicker
StorageFile inputStorageFile = await openPicker.PickSingleFileAsync();

//Loads or open an PowerPoint Presentation
IPresentation pptxDoc= await Presentation.OpenAsync(inputStorageFile);

//Gets whether the presentation is write Protected. Read - only.
bool writeProtected = pptxDoc.IsWriteProtected;

//Checks whether the presentation is write protected
if (writeProtected)
{
     //Removes the write protection for presentation instance.
     pptxDoc.RemoveWriteProtection();
}

//Initializes FileSavePicker
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
savePicker.SuggestedFileName = "Output";
savePicker.FileTypeChoices.Add("PowerPoint Files", new List<string>() { ".pptx" });

//Creates a storage file from FileSavePicker
StorageFile storageFile = await savePicker.PickSaveFileAsync();

//Saves changes to the specified storage file
await pptxDoc.SaveAsync(storageFile);

asp.net core

//Loads or open an PowerPoint Presentation
FileStream inputStream = new FileStream("Sample.pptx",FileMode.Open);
IPresentation pptxDoc = Presentation.Open(inputStream);

//Gets whether the presentation is write Protected. Read - only.
bool writeProtected = pptxDoc.IsWriteProtected;

//Checks whether the presentation is write protected
if (writeProtected)
{
     //Removes the write protection for presentation instance.
     pptxDoc.RemoveWriteProtection();
}

//Save the PowerPoint Presentation as stream
FileStream outputStream = new FileStream("Output.pptx", FileMode.Create);
pptxDoc.Save(outputStream);

//Closes the presentation
pptxDoc.Close();

xamarin

//"App" is the class of Portable project.
Assembly assembly = typeof(App).GetTypeInfo().Assembly;
Stream inputStream = assembly.GetManifestResourceStream("SampleBrowser.Presentation.Samples.Template.Sample.pptx");

//Loads or open an PowerPoint Presentation
IPresentation pptxDoc = Presentation.Open(inputStream);

//Gets whether the presentation is write Protected. Read - only.
bool writeProtected = pptxDoc.IsWriteProtected;

//Checks whether the presentation is write protected
if (writeProtected)
{
     //Removes the write protection for presentation instance.
     pptxDoc.RemoveWriteProtection();
}

//Create new memory stream to save Presentation.
MemoryStream stream = new MemoryStream();

//Save Presentation in stream format.
pptxDoc.Save(stream);

//Close the presentation
pptxDoc.Close();
stream.Position = 0;

//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer presentation/xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
    Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation", stream);
else
    Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation", stream);

NOTE

1. In Xamarin application, this feature is supported from the target framework .NET Standard 2.0 version onwards.
2. For ASP.NET Core, this feature is supported from .NET Core 2.0 version onwards.