EPRS published the study ‘Strengthening resilience – Towards the European Democracy Shield‘, written by Edoardo Bressanelli and Samuele Bernardii.
The announcement introduces the topic as follows:

This study reviews the current framework to protect democracy in the EU in view of the forthcoming European Democracy Shield. It provides a comprehensive map of the existing instruments, while identifying and assessing outstanding policy challenges, regulatory gaps and implementation issues. The study also formulates recommendations to strengthen democratic resilience. The study was commissioned by the European Parliament’s Policy Department for Justice, Civil Liberties and Institutional Affairs at the request of the EUDS Special Committee

The study is here (pdf).

The European Parliament has a Special committee on the European Democracy Shield (‘EUDS’).