Digital signatures are only necessary if you want to securely verify a desktop app comes from you, the developer, which does affect the kinds of security warnings the system shows. This is covered in Exporting to Windows WebView2. There's a similar process called notarization for macOS, which I believe is now mandatory. In both cases only information you opt in to sharing will be included in the digital signature. That all happens outside of Construct though. In terms of what Construct exports, only things you deliberately enter in to the project, such as typing your name in the "Author" field of project properties, will be included in an exported project.