Template

Dear Colleagues,

can it be seen from the source code of a WordPress blog site that runs a company, which template they used for?

Asked the other way around, must not the template be named in the imprint, but where I found nothing, or can a web design company that is responsible for the website, develop a custom template for a WordPress blog that will not be called then?

This is the following site:

http://www.wilex.de

Best

Thobie