The restrictions (commercial) are as per what is stated for
PGP and
PGP tools
To use the PGPLIB DLL, you must first generate your key sets (2
files: secring.pgp and pubring.pgp) with another PGP software. The key
ring files should reside in the working directory from which you run the
DLL
Refer to the README in the zipped package for information on syntax