Oita Prefecture Introduces "GMO Sign Electronic Official Seal" to Begin Digitization of Disposition Notices, etc. [GMO GlobalSign Holdings]

GMO GlobalSign Holdings Corporation (President and CEO: Mitsuru Aoyama, hereinafter referred to as GMO GlobalSign HD) announces that "GMO Sign Gyokaku DX Electronic Official Seal" (hereinafter referred to as "GMO Sign Electronic Official Seal"), a service for digitizing administrative disposition notices and other documents, was introduced by Oita Prefecture (Governor: Juichiro Sato, hereinafter referred to as Oita Prefecture) in February 2026. With this, Oita Prefecture can now issue disposition notices (notification documents based on laws and regulations issued by administrative bodies) as electronically signed electronic documents using "GMO Sign Electronic Official Seal," which were previously issued on paper. This is expected to reduce the time and cost associated with printing and mailing paper documents, enabling more rapid issuance, leading to effects such as improved operational efficiency and cost reduction within the prefecture, and enhanced administrative services that increase citizen convenience by accelerating delivery speed. From April 2026 onwards, Oita Prefecture is expected to commence full-scale operations and digitize disposition notices using "GMO Sign Electronic Official Seal." Introduction Background Oita Prefecture is promoting various DX initiatives to realize its "Oita Prefecture DX Promotion Strategy" (※1), aiming for individual procedures and services to be completed by digital technology, and to provide citizen-centric administrative services 24/7 from anywhere using smartphones and other devices. As a specific measure, in September 2022, they introduced "GMO Sign Gyokaku DX Electronic Contract" (※2), an electronic contract service for local governments developed and operated by GMO GlobalSign HD. In light of this, the Digital Agency also published the "Basic Concept on Digitization of Disposition Notices, etc." (※3) in 2023. Oita Prefecture, to further accelerate administrative service reform, planned the digitization of disposition notices, etc., by promoting the use of electronic signatures, leading to the recent introduction of the electronic official seal. For the formal introduction of "GMO Sign Electronic Official Seal," the "Implementation Support" service, where a dedicated specialist accompanies the introduction, usage, and adoption process through the use of the electronic contract service "GMO Sign," was a key deciding factor. Additionally, the selection points for Oita Prefecture when introducing "GMO Sign Electronic Official Seal" are as follows: ■ Key Points for Oita Prefecture's Introduction of "GMO Sign Electronic Official Seal"

• Can be handled with party-type electronic signatures that include the responsibilities of the chief executive
• Acquired "ISMAP," a security certification established by the Japanese government
• Support for creating operation manuals for "GMO Sign Electronic Official Seal"
• Support for revising regulations etc., through the implementation support service

By utilizing "GMO Sign Electronic Official Seal," significant reductions can be achieved in the time and costs associated with tasks such as printing, mailing, storage, and disposal. It also leads to paperless operations and increased efficiency in administrative work. Furthermore, by strictly managing electronic signature usage rights, it contributes to preventing fraudulent use and strengthening governance. As it complies with the guidelines for digitizing disposition notices, etc., proposed by the Digital Agency to prevent risks such as impersonation and document tampering, disposition notices can be digitized with peace of mind and safety. (※1) "Oita Prefecture DX Promotion Strategy" (February 2026, Oita Prefecture) https://www.pref.oita.jp/uploaded/attachment/2261219.pdf (※2) Press Release | https://www.gmogshd.com/news/news-press-gmo-hs-220929_3385 (※3) Basic Concept on Digitization of Disposition Notices, etc. (March 31, 2023, Digital Agency) (※4) https://www.digital.go.jp/assets/contents/node/basic_page/field_ref_resources/e2a06143-ed29-4f1d-9c31-0f06fca67afc/d92a1cf2/20230411_resources_standard_guidelines_guideline_09.pdf About "GMO Sign Gyokaku DX Electronic Official Seal" (URL: https://www.gmosign.com/e_delivery/) "GMO Sign Electronic Official Seal" is a service that digitizes the approval, signing, issuance, and management of disposition notices by using remote signatures with certificates attached to official roles, instead of the official seals previously used for disposition notices in government offices. It can significantly reduce the time and cost associated with the issuance of disposition notices while maintaining safety and reliability. It complies with the "Basic Concept on Digitization of Disposition Notices, etc." issued by the Digital Agency in Reiwa 5 (2023), and has obtained security certifications (ISMAP, SOC2 Type2, ISO27001, ISO27017) from domestic and international third-party organizations, earning high safety evaluations. Furthermore, as it is registered as an LGWAN-ASP and can be integrated with the core systems used by local governments, it is possible for municipalities to start digitizing disposition notices with confidence. Currently, it has been decided to be introduced in 8 prefectural governments nationwide. About GMO GlobalSign Holdings Corporation GMO GlobalSign HD is an IT security company that provides "safety" and "trust" in internet and digital transactions. It operates "GlobalSign," Japan's top-level Certificate Authority, and provides electronic certification and electronic signature technology to government agencies and companies in 11 countries worldwide. Furthermore, it provides "Electronic Seal GMO Sign," the No. 1 electronic contract service in Japan (※4) utilizing these technologies, to companies and local governments, supporting a safe social infrastructure. Moving forward, the company plans to expand its services globally, developing and providing authentication technologies that can also cope with the era of quantum computing, in addition to advanced technologies such as AI, IoT, and blockchain, for safer and more user-friendly services. It aims to be a presence that supports the growth of the digital society by balancing "reliable authentication" with "high cost performance." (※4) Cumulative number of transmitted contracts with electronic signatures and timestamps based on the Electronic Signature Act (excluding contracts with timestamps only; targeting major witness-type electronic signature services) Researched by GMO Research & AI, Inc. (December 2024) Above *** Inquiries regarding services: ● GMO GlobalSign Holdings Corporation Digital Government Support Office Inquiries: https://www.gmosign.com/form/go_dx/ GMO GlobalSign Holdings Corporation (URL: https://www.gmogshd.com/) Company Name GMO GlobalSign Holdings Corporation (Tokyo Stock Exchange Prime Market Securities Code: 3788) Location Cerulean Tower, 26-1 Sakuragaoka-cho, Shibuya-ku, Tokyo Representative Mitsuru Aoyama, President and Representative Director Business Description ■Electronic Certification & Seal Business ■Cloud Infrastructure Business ■DX Business Capital 916.9 million yen GMO Internet Group, Inc. (URL: https://group.gmo/) Company Name GMO Internet Group, Inc. (Tokyo Stock Exchange Prime Market Securities Code: 9449) Location Cerulean Tower, 26-1 Sakuragaoka-cho, Shibuya-ku, Tokyo Representative Masatoshi Kumagai, Group Representative, President and Representative Director Business Description Holding company (group management function) ■Group Business Activities Internet Infrastructure Business / Internet Security Business / Internet Advertising & Media Business / Internet Financial Business / Cryptoasset Business Capital 5 billion yen Copyright (C) 2026 GMO GlobalSign Holdings K.K. All Rights Reserved.