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arxiv_cl 75% Match Research Paper Legal professionals,Judiciary,Data privacy officers,NLP researchers,Software developers in legal tech 3 weeks ago

Thunder-DeID: Accurate and Efficient De-identification Framework for Korean Court Judgments

large-language-models › multimodal-llms
📄 Abstract

Abstract: To ensure a balance between open access to justice and personal data protection, the South Korean judiciary mandates the de-identification of court judgments before they can be publicly disclosed. However, the current de-identification process is inadequate for handling court judgments at scale while adhering to strict legal requirements. Additionally, the legal definitions and categorizations of personal identifiers are vague and not well-suited for technical solutions. To tackle these challenges, we propose a de-identification framework called Thunder-DeID, which aligns with relevant laws and practices. Specifically, we (i) construct and release the first Korean legal dataset containing annotated judgments along with corresponding lists of entity mentions, (ii) introduce a systematic categorization of Personally Identifiable Information (PII), and (iii) develop an end-to-end deep neural network (DNN)-based de-identification pipeline. Our experimental results demonstrate that our model achieves state-of-the-art performance in the de-identification of court judgments.
Authors (5)
Sungeun Hahm
Heejin Kim
Gyuseong Lee
Hyunji Park
Jaejin Lee
Submitted
June 18, 2025
arXiv Category
cs.CL
arXiv PDF

Key Contributions

Proposes Thunder-DeID, an end-to-end de-identification framework for Korean court judgments that aligns with legal requirements. It introduces the first Korean legal dataset with annotated judgments and PII, a systematic PII categorization, and a DNN-based pipeline to address the challenges of de-identification at scale.

Business Value

Enables public disclosure of court judgments while protecting personal data, fostering transparency in the judiciary and compliance with privacy regulations.