Can an EU Data Act data holder use trade secrets to block product or related service data access?
Not as a blanket answer. Articles 4 and 5 preserve trade secrets, but they require the data holder or trade secret holder to identify the protected data and agree necessary, proportionate technical and organisational measures before disclosure. The Commission FAQ is explicit that a trade secret claim by itself is not enough to defeat Data Act access rights.
For implementation, treat trade secret protection as a scoped safeguard process: identify the exact data fields or metadata that reveal the secret, decide whether access is to the user or to a third party, and define the controls that preserve confidentiality while leaving the Data Act access route available.
- Do not mark an entire export, API, log stream, or dataset as unavailable without identifying the trade secret elements.
- Record whether the issue arises under Article 4 user access or Article 5 sharing with a third party, because the recipient and challenge route differ.
- Separate trade secret protection from personal data, product security, and competitive-use restrictions so each limit has its own legal basis and evidence.
Article 4(6) and Article 5(9) preserve trade secrets while requiring identified protected data and proportionate measures before disclosure.
Question 23 explains that a trade secret claim alone is not enough to prevent the Data Act access rights from being exercised.