'jointly-created' originates from the combination of 'jointly' and 'created', where 'jointly' means 'together' and 'created' means 'brought into existence'.

'jointly' and 'created' have been used separately in English for centuries, but their combination into 'jointly-created' is a more modern usage to describe collaborative efforts.

Initially, 'jointly' and 'created' were used separately, but over time, their combination has come to specifically denote collaborative creation.