With a lobstering license in Maine, there is no maximum catch of lobsters you must abide by, like in other fisheries. Limits are set on number of traps, and timing of when traps may be set, but are not determined by actual number of caught lobster. However, sometimes you cannot keep all the lobsters you catch. In Maine both size and gender affect whether a lobster is a “Keeper” or not. See Sex Regulations and Size Requirements for more information!
More info on laws: https://lobsteranywhere.com/seafood-savvy/maine-lobster-laws/