Many technical universities (TU9) in Germany, Austria, and Switzerland have campus-wide licenses. If you are a student or researcher, check your university library’s "Normenlizenz" (Standards License). You can often download DIN 19704 for free from a campus computer or via VPN.
The exclusive sales partner for DIN standards is Beuth Verlag (now part of the VDE Verlag group). They offer the official, watermarked PDF. din 19704 pdf link
Advantage: You receive the definitive, current version (with any corrigenda incorporated). You can print it once for personal use. Many technical universities (TU9) in Germany, Austria, and
To get the legitimate PDF, you must purchase it from an authorized distributor. Advantage: You receive the definitive, current version (with