I have used GFL SDK for a year. It's really wonderfull!

Now I am going to start a commercial use. My program operates with medical images. I need "libgfl240.dll" & "Xjp2.dll" to save (& load) them with high compression using jpeg2000.
Questions

How much must I pay you for "libgfl240.dll"? What about further upgrades?
Whom must I pay for "Xjp2.dll"? How mutch? How?
What one license allows?
Merci.