Office Open XML 15 Shared 15.2 Part Summary 15.2.7 Digital Signature Origin Part 15.2.7 Digital Signature Origin Part This part is defined in 13.2.1, “Digital Signature Origin Part”, of ISO/IEC 29500-2. Last updated on March 14, 2025 15.2.6 Custom XML Data Storage Properties Part15.2.8 Digital Signature XML Signature Part