Hi, Villyee.
Yes, you can start a business specializing in QlikView development.
However, what you would not be able to do is sell licences without being a partner although you may be able to point customers to trusted partners. Also, partners will get beta versions and updates prior to customers and independent consultants.
Consequently, your revenue would come from developing solutions for clients rather than the provision of software licences.
Regards,
Neil
