If you do not have a valid certificate, you may be denied entry.

Now you have a valid certificate for this funky domain.

Under the Bill, legal practitioners will only be able to practice if they hold valid practising certificates.

One needs a valid certificate of disability(in case it is not apparent) to board the compartment.

If they can provide a valid certificate, then you should not charge them the levy.

And so in fact there isn't a valid certificate.

Signer object in a script itself, provided a valid certificate is present on the system.

This means that they must hold a valid certificate of competence in either:

The website provides a valid certificate, which means it was signed by a trusted authority.

You can create a valid signature without using a valid certificate and add it to the list.