license for develop and production server

Hi,

I've to buy a Drupal Evolve theme to upgrade an existent server.
To do this I have a temporary developing server where test and configure the upgrade. (migration from Drupal 6 to Drupal 7 and then apply new theme)
At the end of the test I will transfer the configuration on production server and then delete it from the developing server.
Can I do this with one license ?

Regards