definiens: means a copy of the source code corresponding to the Software, including all Source Code UpdalCs delivered to the Escrow Agent from time to time pursuant to this Agreement, plus any pertinent commentary or explanation that may he necessary to render the Source Code understand able and useable by a computer - programming expert The Source Code shall include system documentation, statements of principles of operation and schematics, all as necessary or useful for the effective understanding and use of the Source Code _ Insofar as the employed by Licensor for the development, maintenance, and implementation of the Source Code includes any device, programming, or documentation not commercially available to Licensee on reasonable terms through readily known sources other than Licensor, the Source Code shall include all such devices ' programming, or documentation . The foregoing reference to such is intended to apply to any programs, including compilers, tools . and higher - lev el ( or ) languages, used by Licensor for the development, maintenance, and implementation of the Source Code