http://u.qdnx.org/file/erkan-20150130T183940-r2m49s8.html
probably because: "Why not #opensource everything from #telegram? All code will be released eventually. We started with the most useful parts - a well-documented API that allows developers to build new Telegram apps, and open source clients that can be verified by security specialists." https://telegram.org/faq#q-why-not-open-source-everything cc @imn00b