The excellent clause on electronic

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Signatures catalyzed the use of electronic signatures using application domain certification authorities. The organizations that started application domain certification authorities were aware that the golden rule was to preserve one or more incontrovertible proofs of the link between the signers and their public key. This guaranteed them a high probative value of digitally signed messages and their link to the signer, in the event of any contingency or contention.

Organizations trying to get digital signature systems up and running found that:

It was much easier, cheaper, and just as secure to certify your users with your own authority than through regulated certificate authorities.
In the vast majority of applications, the legal party called “the trustor” is the Sweden Mobile Database organization itself implementing the signature in its application domain.
There is a user enrollment process with the application domain. This means that the certificate resides in the user's record with the application domain and, therefore: a) the application domain is protected from the problem of false certificates, b) the problem of revocation is reduced, and c) the certificates are only valid in the application domain and do not represent any risk outside the domain.