China: TC260 closed consultation on Guidelines on Identification Methods for AI-Generated Synthetic Text Content

On 6 July 2025, the National Cybersecurity Standardisation Technical Committee of China (TC260) closed its public consultation on the draft Cybersecurity Standard Practice Guide – Artificial Intelligence Generated Synthetic Content Identification Method: File Metadata Implicit Identification for Text Files. The consultation focuses on the draft technical guide, which is based on the mandatory national standard GB 45438-2025 Cybersecurity Technology—Identification Methods for AI-Generated Synthetic Content. The consultation sought feedback on proposed schemes for embedding implicit identifiers in file metadata, including JSON-based structures for OOXML/UOF/OFD, PDF dictionary entries, and YAML-style headers for Markdown. The Guide aims to standardise identifiers for content provenance, service providers, and propagation tracking, as specified in referenced standards such as ISO/IEC 29500 and GB/T 33190.