Hi Eduardo,
Correct, the client you're working with would need to have a subscription for the software in order to have access to the code. This is typically available through a Totara Partner who provides support and services around the software, including installation, configuration, and a helpdesk.
For Subscribers that feel comfortable managing their own code, they can reach out to us directly to acquire a subscription. My understanding is that Moodle Workplace is offered through a Partner program as well, if that helps with understanding how the distribution and licensing is managed.
You're also welcome to reach out to one of our Channel Partner Managers, just let me know what region you're located in (EMEA, Americas, or APAC).
Thanks!
Wes