It also depends on the violated party still existing and caring enough to pursue a lawsuit. Many of the entities that own these copyrights don't exist anymore.

It also depends on the violated party still existing and caring enough to pursue a lawsuit. Many of the entities that own these copyrights don't exist anymore. And I don't think a Windows 3.1 demo on the web is potentially damaging enough to Microsoft's profits to make it worthwhile for them to sue the Internet Archive.