The Qualified Electronic Seal, provided by a validated service provider, is necessary for the electronic verification of your organisation during registration on the EPREL database.
Please check this link for more information on registration and verification.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.