There is a way to get permanently activated digital bound license for the Win *Enterprise for free. Whenever you would reinstall or install newly released/upgraded next version of Win *Enterprise .ISO (not for the LTSC/LTSB, don't mess up!), you wouldn't have to worry about activation and all that bs, only when you'd upgrade your PC components, you might lose activation. No hacks, no spending $, mess with activators and shiet, totally clean latest *Enterprise from the get go.
*Hint: It's not actually for the Enterprise, but identically equal version with same feature and update cycle.