You can buy a fishing license in several ways depending on your location:

• Luxembourg : Inland fishing licenses can be purchased online via the MyGuichet.lu website, with payment by credit card, and the license is delivered as a PDF by email or in your private eSpace. You can also obtain licenses in person at Civil Registry Offices in Luxembourg, Grevenmacher, Diekirch, and Esch-sur-Alzette

• England and Wales : You can buy a rod fishing license online for 1-day, 8-day, or 12-month durations on the official GOV.UK website. Licenses can also be obtained by calling the Environment Agency or via post/email delivery

• Florida, USA : Fishing licenses are available online at GoOutdoorsFlorida.com, in person at license agents or tax collector offices, by phone, or through the Fish|Hunt FL mobile app

• Pennsylvania, USA : Licenses can be purchased online at HuntFish.pa.gov, with options for annual or multi-year licenses and additional permits for certain waters

• Illinois, USA : Fishing licenses go on sale starting March 1 each year and can be purchased online or through vendors; details are provided by the Illinois Department of Natural Resources

• California, USA : Licenses can be purchased online via the California Department of Fish and Wildlife website, at license sales offices, or through independent license agents and by phone

In summary, fishing licenses are commonly available online through official government or wildlife agency portals, by phone, and in person at designated offices or agents. Check the specific website or agency for your region to purchase the appropriate license.