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They're probably using the BDB Java Edition which uses a GPL-compatible license and does require all source code be released with program distribution. Looks l

• borislav 17y ago
  We are using the C version of BDB (which is also GPL) because this makes potentially accessible from C++ if anyone cares to port the Java code :) The Java version actually started started as prototype that would become the "real" C++ version. As for the license, HyperGraphDB is LGPL in the sense that a version where the BDB dependency is removed will have no strings attached for commercial use. Architecturally, HyperGraphDB has a low-level storage layer that is isolated by a handful of classes and is currently implemented with BDB. So it is not such a major undertaking to replace it, given a suitable (in terms of license, functionality etc.) replacement.