The 2026 Guide to Admissible Digital Evidence for IP Litigation

Japan Edition

The IP High Court, JIPDEC timestamps, and Japan's secrets protection order framework.

CPC framework — 2022 amendments addressing digital proceedings directly
Act on Electronic Signatures — accredited CA presumption of authenticity
Article 234 CPC pre-action evidence preservation — available before suit is filed
JIPDEC ISO 18014-compliant timestamps (trusted TSA)
Secrets protection order (秘密保持命令) with criminal penalties for violation
Emerging issues 2026: AI inventorship, JPO digital transformation

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JIPDEC

ISO 18014 trusted timestamp

Japan's accredited timestamp authority. JIPDEC-compliant RFC 3161 timestamps are accepted in IP High Court proceedings and create a presumption of digital authenticity under the Act on Electronic Signatures.

Art. 234

Pre-action evidence preservation

Available before suit is filed, court-supervised, and capable of preserving digital evidence at risk of deletion. Rarely invoked by foreign practitioners — almost always available.

刑事罰

Criminal penalties apply

Violating a secrets protection order (秘密保持命令) carries criminal penalties under the Patent Act. It is one of the most powerful procedural tools in Japanese IP litigation.

Key Principle

Japan's secrets protection order (秘密保持命令) prohibits recipients from using designated trade secret information for any purpose other than the litigation — with criminal penalties for violation.

What's Inside

Eight chapters. Court-ready guidance.

I Japan's Landscape — IP High Court, Tokyo vs Osaka practice cultures

II CPC Framework — 2022 amendments, Article 228, free evaluation standard

III Act on Electronic Signatures — accredited CA presumption of authenticity

IV Collection — Article 234 CPC preservation, notarial capture (公証人)

V Chain of Custody — JIPDEC timestamps, ISO 18014, trusted TSAs

VI Web Evidence Hierarchy — screenshots, HTML & HAR files compared

VII IP-Specific Evidence — source code, secrets protection orders, Article 220

VIII Emerging Issues 2026 — AI inventorship, JPO digital transformation