1. The license is for the B1 Pack Project, and not for B1 Free Archiver
(proof)
2. It does not matter what license they use internally if they does not
release the source code for the program
No matter from what point of view of you're looking at it, the program is
still proprietary, and that does not change until the company developing the
application does not change their mind (very unlikely, since they promote
freeware and shareware distribution*).
* "We are also interested in cross-selling or cross-promotion partnership
with credible freeware or shareware distributors." (source)
