Hmm... Perhaps to gain a license, the player would have to ask a NPC for the license. The player would have to somehow prove they are competent, such as a quest/mission, doing the job under restrictions, etc. The exception would be guild members, in which case the guild leader will assign the licenses. Or have someone else do so for him/her.
And if you decide to sabotage the job area, then obviously, you are fired. Which is a bad thing unless you were paid to sabotage and didn\'t care about being fired...