You need the license option "Managed Services Use" whenever you monitor IT infrastructure that you operate for or provide to a "third party". A "third party" is a company that is not legally part of your company, i.e. it is not an affiliated company, shareholder, or have other similar interests. The third party is simply a customer. It is irrelevant whether the third party itself uses the software or whether you use it only internally, for example, to ensure your own service level agreements towards this customer. It is also irrelevant who owns the infrastructure and whether this infrastructure is located in your data center or in that of your customer. Typical examples: - You use Checkmk to monitor physical or virtual infrastructure that you make available to a Managed Services customer for exclusive use (e.g. provision of virtual machines or hosting physical servers) - You use Checkmk to monitor physical or virtual infrastructure that you operate for a specific Managed Services customer of yours (e.g. as part of a broader Managed Services agreement). The license option 'Managed Services Use’ is not required if you only provide your customers with services (e.g. SaaS, email, databases or online shops), but no infrastructure for them to use exclusively. A special feature of the Managed Services license is the purely passive right of use for the Managed Services customer. This means that your Managed Services customer may only have read access to the web interface to retrieve information and/or reports and set maintenance periods. Your Managed Services customer is not entitled to active use, especially in the form of own configuration changes. If this is intended, this customer would require their own separate Checkmk subscription. The Managed Services Usage license option always includes the possibility of using the software as a group. This is already included for customers with the subscription 'Checkmk Enterprise Managed Services Edition' Checkmk Enterprise Managed Services Edition and must only be purchased separately for the Checkmk Enterprise Standard Edition. Conversely, the Group Use license option always includes the possibility of using the software as a managed service provider.