The file otr.min.js includes:
    - minified versions of the following otr.js dependencies:
      otr/dep/bigint.js otr/dep/crypto.js otr/dep/eventemitter.js
      The following minification tool has been used: yui compressor
    - minified version of otr.js taken from the project homepage

All original files can be retrieved from otr.js repository:
    https://github.com/arlolra/otr/tree/master/build

See the README file of Libervia, or inside otr.min.js itself for licence information.