Jemma Costin

Solicitor

Dispute Resolution, Technology, Media and Telecoms

Jemma Costin, Solicitor, Dispute Resolution TMT, Brighton, DMH Stallard LLP
Jemma is a solicitor in the Dispute Resolution TMT team specialising in commercial dispute resolution, with a focus on intellectual property (IP) and technology disputes.

She has acted for clients in the media, retail, technology, hospitality and video games sectors in proceedings before the High Court and Intellectual Property Enterprise Court, as well as at pre-action and settlement stages.

Her experience includes copyright, trade mark and design disputes, breach of contract claims, shareholder and partnership disputes, defamation and reputation management and contentious data protection matters. She also completed a six-month secondment to a global video games company, advising on IP, commercial and consumer law issues in the interactive entertainment sector.

Jemma’s academic writing on IP enforcement in video games was published in the Interactive Entertainment Law Review (2026, Vol 9(1)), and she has lectured in intellectual property law at Goldsmiths, University of London.

Before her legal career, Jemma completed a degree in Music and maintains a strong interest in the creative and technology sectors.

Work highlights

COPYRIGHT AND DESIGN RIGHT CLAIM

Supported the Defendants in a complex copyright and design right claim in the Intellectual Property Enterprise Court related to the hospitality sector, assisting from pleadings through to settlement


ENFORCEMENT

Acted for a global fashion brand in trade mark oppositions and anti-counterfeit enforcement


BREACH OF CONTRACT AND COPYRIGHT DSIPUTE

Advised on a breach of contract and copyright dispute in the Intellectual Property Enterprise Court regarding an NFT viewer, achieving the withdrawal of a default judgment application


MULTI-ANGLED CLAIM

Supported the Defendants in a multi-issue misuse of private information, breach of confidential information, breach of data protection claim


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Recent articles

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Defective advice, deficient security: professional negligence in the lending sector

In this article we highlight the areas from which professional negligence claims most frequently arise, and some key considerations for protecting your position.

02/06/2026

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Aabar v Glencore: Latest development on legal advice privilege and intra-client communication

Legal advice privilege (“LAP”) was understood to protect only confidential communications passing directly between a lawyer and client for the dominant purpose of giving or receiving legal advice.

11/05/2026

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Theft or Conversion? A tale of two tokens

Almost 7 years on from the UK Jurisdiction Task Force’s seminal report on the law of property relating to purely digital assets and 3 years on from the Law Commission’s own 2023 report on the subject.

21/04/2026

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Has data protection compliance become a little easier?

Three changes that may simplify your day-to-day compliance and a new complaints’ regime arriving this summer.

07/04/2026

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