Digital postmark helps fight spam, virus attacks
Terry Costlow · IEEE Distributed Systems Online · 2004
Researchers at Penn State have developed a method to trace Internet messages' regions of origin. By marking only the messages' region, not the specific source site, the technique alleviates some privacy concerns while enable to trace the origins of spam, virus attacks, or illegally copyrighted materials. Any tracing process immediately raises privacy concerns. However, because the digital postmark doesn't identify individuals, it identifies only region.