Communisis Plc v The Tall Group of Companies Ltd & Ors
Decision date: 17 November 2020
Neutral citation: [2020] EWHC 3089 (IPEC)
Overall AI summary confidence: high
Short overview
This short overview is intended to summarise the case, issues and outcome so far as they are supported by the judgment.
AI confidence in this short overview: high
This case concerned UK Patent GB2512450B claiming generation of a cheque security code (UCN) by converting personalisation data to a higher base and printing it on cheques. The defendants admitted the acts but denied infringement and challenged validity; the judge construed the claims narrowly to the taught base‑conversion algorithm and found the patent invalid both for lack of inventive step (over Martens, Ehrat and Martin) and as excluded subject‑matter (a mathematical method). The infringement claim was dismissed on normal construction because the defendants’ hashed‑output approach did not fall within the claims as properly construed.
Ratio decidendi
This summary is intended to identify the ratio decidendi, meaning the legal reasons for deciding and the binding part of the decision.
AI confidence in this ratio decidendi summary: high
The judge’s ratio is that where a patent’s specification teaches only base conversion as the algorithm for generating a code, the claims must be read to cover that taught embodiment (conversion to a higher base) rather than be extended to cover all cryptographic functions merely presented in a higher base; applying that construction, the patent was obvious over the cited prior art and also constituted an excluded mathematical method under s.1(2) Patents Act 1977. The judge also held that decryption is not an essential feature of the claimed validation step.
Obiter dicta
This summary is intended to identify obiter dicta, meaning observations made by the way that were not necessary to deciding the case and are not binding.
AI confidence in this obiter dicta summary: medium
The judgment contains obiter observations that construing claims so as to monopolise all cryptographic functions presented in a higher base would exceed the patentee’s contribution and conflict with the patent “social contract,” and that the skilled addressee in banking security contexts may encompass both financial/banking and cryptographic expertise (possibly in a single person).
Warning
Some extracted text shows typographical/OCR artefacts (e.g. garbled words like "retUCN"); care should be taken if quoting directly. Notes contain some typographical/OCR artefacts; they may be incomplete or noisy.