License
A license was a legal document giving someone the right to engage in various commercial or professional activities. 

When Spock treated a weakened Leonard McCoy in the Sarpeidon Ice Age, Spock rated McCoy's progesss as "excellent", to which McCoy replied that Spock was practicing medicine without a license and that Zarabeth shouldn't let him doctor her. ()

A license was required to provide channels in the Interface in 2024. After Christopher Brynner had agreed to violate his operating license by giving the inhabitants of Sanctuary District A access, he commented that he'd lose his license but "get great ratings". ()

In the 22nd century, the Earth Cargo Authority issued licenses to its freighter captains. After Mayweather had become captain of his ship, it fell behind schedule, so Mayweather almost lost his ECA license. ()

By 2268, Cyrano Jones was a licensed asteroid locator and prospector. ()

On Deep Space 9 in the 2370s, Quark had a license to operate holosuites. When Quark used his holosuites to negotiate weapon deals in 2373, he was confronted by Odo, who told him he didn't have a license to sell weapons though. ()

In late 2374, Vedek  raised funds on Deep Space 9's promenade without a license, for which he was placed in a holding cell by Odo. ()

On Quarra in 2377, the brainwashed Kathryn Janeway had level six licenses in thermal dynamics and quantum fusion, which impressed a supervisor. ()

Licenses
 Business license
 Driver's license
 Import license
 Interface operating license
 Master's license
 Medical license
 Pilot's license
 Trading license

See also
 Artistic license
 License plate
 Licensing agreement

External link
 

Legal documents