GUST font licenses

Abstract
For some time the problem of font licenses was discussed at the BachoTeX conferences and in various mail exchanges. The approach presented here tries to address the following issues: first, making sure that fonts developed for the TeX world, where backwards compatibility is very important, will not be broken by “uncontrolled” modifications and second, addressing the issue of the notion of font source code files. As a result, two GUST font licenses were formulated.