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CTH Licensing Information

CTH is Export Controlled software and is available for site license to U.S. Government agencies and contractors working under contract to the U.S. Government or one of its agencies. A Government Use Notice that outlines the terms and restrictions of CTH use must be signed by an officer of your organization.

We charge a fee of $1,000 for distribution of CTH to licensees working under contract to the U.S. Government. The fee will entitle the licensee to software updates for a period of one year.

Commercial licenses for CTH are available but will include a fee that depends on the number of users and sites. These licenses are negotiated on a case by case basis. Several non-U.S. sites have commercial CTH licenses under approved U.S. Dept. of State export licenses. Please contact for questions about commercial or non-U.S. licenses.

CTH is written in Fortran 90 and C and can be built under most versions of Unix, Linux and Mac/OSX operating systems. The CTH distribution package is completely self contained and requires no additional pre- or post-processors. The distribution contains pre-built executables for Linux, Windows and Mac/OSX and source code and make files for other Unix systems. For the pre-built Windows and Linux versions, software license keys are used to tie the executables to a specific machine.

If you would like to obtain CTH for use on a government contract you will need to obtain a current Government Use Notice with an assigned agreement number. Please send an email containing the information below to to obtain the appropriate licensing paperwork.


David Crawford: