A training application (TrApp) is configured to train an AI/ML based model; sending to a license management function (LiMnF) in a network a request (R1) for acquiring a license for accessing operator data generated by one or more network entities in the network; receive, from the license management function (LiMnF) in response to the request (R1) for acquiring a license, at least one license credential, wherein the license credential identifies operator data to which the training application (TrApp) is allowed to access; send at least one request (R3) for accessing operator data, the at least one request for accessing operator data including the at least one license credential; receive in response to the at least one request (R3) for accessing operator data the operator data to which the training application (TrApp) is allowed to access. The AI/ML based model may be trained using received operator data as training data.