I will answer to myself (after having been trying for over an hour, I found the answer a couple of minutes after posting my question)
products = Product.objects.filter(productlicence__client=client).distinct() -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.

