A significant portion of the protocol knowledge in Alkahest is based on research done by the developers of the tera-data and Shinra Meter projects.
The encryption code is based on the defunct TERA emulator project; a license was not specified for that code. It has been simplified based on Mirrawrs's Tera framework.
The data center parsing code is based on the file format knowledge in the TeraDataTools project.
The client scanning functionality uses search patterns from Mirrawrs's Tera framework and some other defunct projects.