The USB Dongle is a more portable option for registering your Bytescribe software. For just a little more (usually $15), you get the ability to move the software registration from computer to computer as many times as is needed. If you think you may need to move your registration often (multiple computers, using a laptop while you travel, etc.), you should probably go ahead and get a Dongle.
Product Serial Number licenses are valid for single concurrent registrations and have a lifetime limit of three consecutive registrations. This is a good option for office computers and individuals who plan on using one computer to run the software.
Feel free to contact our sales department with any questions you may have regarding what option is best for you.