In accordance with Directive (EU) 2016/1148, digital service providers remain free to take technical and organisational measures they consider appropriate and proportionate to manage the risk posed to the security of their network and information systems, as long as those measures ensure an appropriate level of security and take into account the elements provided for in that Directive.

When identifying the appropriate and proportionate technical and organisational measures, the digital service provider should approach information security in a systematic way, using a risk-based approach.

In order to ensure the security of systems and facilities, digital service providers should perform assessment and analysis procedures. These activities should concern the systematic management of network and information systems, the physical and environmental security, the security of supplies and the access controls.

When carrying out a risk analysis within the systematic management of network and information systems, digital service providers should be encouraged to identify specific risks and quantify their significance, for example by identifying threats to critical assets and how they may affect the operations, and determining how best to mitigate those threats based on current capabilities and resource requirements.

Policies on human resources could refer to the management of skills, including aspects related to the development of security related skills and awareness-raising. When deciding on an appropriate set of policies on security of operation, the digital service providers should be encouraged to take into account aspects of change management, vulnerability management, formalisation of operating and administrative practices and system mapping.

Policies on security architecture could comprise in particular the segregation of networks and systems as well as specific security measures for critical operations such as administration operations. The segregation of networks and systems could enable a digital service provider to distinguish between elements such as data flows and computing resources that belong to a client, group of clients, the digital service provider or third parties.

The measures taken with regard to the physical and environmental security should ensure the security of an organisation's network and information systems from damage caused by incidents such as theft, fire, flood or other weather effects, telecommunications or power failures.

The security of supplies such as electrical power, fuel or cooling could encompass the security of the supply chain that includes in particular the security of third party contractors and subcontractors and their management. The traceability of critical supplies refers to the ability of the digital service provider to identify and record sources of those supplies.

The users of digital services should encompass natural and legal persons who are customers of or are subscribers to an online marketplace or a cloud computing service, or who are visitors to an online search engine website in order to undertake keyword searches.

When defining the substantiality of the impact of an incident, the cases laid down in this regulation should be considered as a non-exhaustive list of substantial incidents. Lessons should be drawn from the implementation of this Regulation and from the work of the Cooperation Group as regards the collection of best practice information on risks and incidents and the discussions on modalities for reporting notifications of incidents as referred to in points (i) and (m) of Article 11(3) of Directive (EU) 2016/1148. The result could be comprehensive guidelines on quantitative thresholds of notification parameters that may trigger the notification obligation for digital service providers under Article 16(3) of Directive (EU) 2016/1148. Where appropriate, the Commission could also consider reviewing the thresholds currently laid down in this Regulation.

In order to enable competent authorities to be informed about potential new risks, the digital service providers should be encouraged to voluntarily report any incident whose characteristics have been previously unknown to them such as new exploits, attack-vectors or threat actor, vulnerabilities and hazards.

This Regulation should apply on the day following the expiry of the deadline for transposition of Directive (EU) 2016/1148.

The measures provided for in this Regulation are in accordance with the opinion of the Network and Information Systems Security Committee referred to Article 22 of Directive (EU) 2016/1148,