In at least some jurisdictions, the process of getting married involves “a marriage license”, and I think of a license as something that provides a privilege to and imposes an obligation upon someone, and potentially multiple privileges and/or obligations.
Regarding “restrictions”:
In at least some jurisdictions, the process of getting married involves “a marriage license”, and I think of a license as something that provides a privilege to and imposes an obligation upon someone, and potentially multiple privileges and/or obligations.
A license is “Freedom to deviate deliberately from normally applicable rules or practices (especially in behaviour or speech)”, so if there are any “restrictions” then they just apply by default, and people with a marriage license get to ignore some of them (in exchange for having some additional obligations/restrictions).