Your Lightroom License Key is
a. Single user/owner.
b. It is Mac and or Win.
c. The license agreement allows two active installations with one in use at any point in time.
d. You can uninstall and install as often as necessary, subject to the above.
e. There is no deactivate process as required by other Adobe products. You are just expected to adhere to the above.
Thank you so much!