Get your MD license online at:
https://www1.md.wildlifelicense.com/
I prefer to get mine online every year. When the .pdf file pops up to prine, I print off 3 or 4 copies and then SAVE THE FILE to my computer in case I need additional copies throughout the year.
Having several different tackle bags, as well as a small amount of gear and a rod on my boat even when I'm just going out for a family day on the water, it's easy to forget where one lousy piece of paper is. So I just put copies EVERYWHERE.