Why are professional stamps or seals affixed to certain workplace documents?

The professional stamp or seal is one of the most important legal tools entrusted to regulated members (such as P.Techs or Professional Engineers). It is not merely a bureaucratic "finalized" stamp (Option A), nor is it a mechanism for establishing copyright (Option B) or sharing contact information (Option C). Affixing a professional seal to a document (such as design drawings, specifications, or technical reports) is a legally binding declaration. It signifies to the public, clients, and municipal authorities that a legally qualified professional either personally prepared the work or directly supervised its preparation. More importantly, it serves as a formal guarantee that the professional explicitly accepts full legal and professional responsibility for the accuracy, safety, and code compliance of the contents. If a sealed design fails and causes injury, the professional who applied the seal is the individual held legally accountable for negligence.