The 2026 Guide to Admissible Digital Evidence for IP Litigation

United Kingdom Edition

PD 57AC, PD 57AD, and the NPCC principles — the UK's definitive digital evidence framework.

Civil Evidence Act 1995 & PD 57AC/57AD framework explained
NPCC Four Principles — the UK gold standard for digital evidence
ESI disclosure under PD 57AD (permanent since October 2022)
Norwich Pharmacal orders for platform data production
eIDAS retained timestamps & hash chain verification
Emerging issues 2026: Data (Use and Access) Act 2025

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Oct 2022

PD 57AD became permanent

The ESI Disclosure Practice Direction — replacing PD 51U — has been permanent law since October 2022. Many firms are still operating on the old pilot rules.

NPCC principles

The UK gold standard for digital evidence collection — originating in criminal forensics, now the benchmark for civil proceedings. Most IP litigators have never heard of them.

£500k

IPEC damages cap

Evidence strategy in IPEC must be proportionate to this ceiling. Elaborate forensic authentication may cost more to produce than the matter is worth.

Key Principle

Practice Direction 57AC prohibits witness statements from drawing inferences — a collector's statement must describe what they did, not what the hash value proves.

What's Inside

Eight chapters. Court-ready guidance.

I UK IP Litigation Landscape — Patents Court vs IPEC, post-Brexit divergence

II Legal Framework — Civil Evidence Act 1995, PD 57AC & PD 57AD explained

III NPCC Four Principles — the UK gold standard for digital evidence

IV Collection & Preservation — Norwich Pharmacal orders, platform data

V Chain of Custody — hash verification, retained eIDAS timestamps

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

VII Disclosure — PD 57AD Extended Disclosure, Sedona Principles

VIII Emerging Issues 2026 — AI evidence, Data (Use and Access) Act 2025