Trusted Service Status Lists
Trusted Service Status Lists (TSLs) are lists of trusted services, published by different organisations, e.g. the Odette organisation. Those lists contain trusted issuer certificates, which are needed to validate certificates. Only certificates, whose issuer certificates are present in one of the activated validation sources can be validated successfully. If the module OFTP2 is licensed !MC5 by default activates the usage of the Odette OFTP2 TSL and it's internal default certificates, which are needed to verify the signature of the OFTP2 TSL.
Every TSL is signed by its publisher. To use the certificates contained in a TSL, that signature must validate. If the List is signed using an issuer certificate, it can be added to the user defined certificates by viewing the signer certificate and then clicking the Save certificate button inside the certificate preview dialog.