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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.io.packaging.packagedigitalsignature below:

PackageDigitalSignature Class (System.IO.Packaging) | Microsoft Learn

PackageDigitalSignature Class Definition

Represents a digital signature that is applied to a set of package parts and relationships.

public ref class PackageDigitalSignature

public class PackageDigitalSignature

type PackageDigitalSignature = class

Public Class PackageDigitalSignature

Inheritance

A PackageDigitalSignature object is immutable and cannot be altered after it is created.

For security, a PackageDigitalSignature can be associated with parts within a Package. A PackageDigitalSignature incorporates an X.509 certificate that provides two features:

Identifies and authenticates the originator of the part.
Validates that the part has not been modified.

The digital signature does not preclude a part from being modified, but a validation check against the signature fails if the part has changed in any way. The application can then take appropriate action - for example, it can prevent the part from opening or it can notify the user that the part has been modified and is not secure.