GDOC is not in the public domain. However, we are glad to make it available, without charge, for both education and non-profit research purposes (see the License Terms and Conditions for details). For downloads please contact awechsun [at] mit [dot] edu (Achim Wechsung) and please use your academic email for correspondence.
While the authors acknowledge that both the design and implementation of GDOC are far from perfect, the source code for these programs is provided so that other researcher may understand the exact algorithms employed and use these tools however they see fit. In fact, we openly encourage other researchers to extend and improve upon this code based on their own endeavors. We would very much like to hear about your experience with it!
Any entity desiring permission to incorporate GDOC, or a work based on GDOC, into commercial products or otherwise use it for commercial purpose should contact Prof. Paul I. Barton.