The code running on the ATtiny85 is based on OpenSkyRX by readerror67. It originally contained the following notice:
/*
* Frsky RX 2-way
* By Midelic
* on RCGroups
* an adaptation from Kyrre Aalerud(Kreature)
* 2012 Frsky rx demo code
* http://www.rcgroups.com/forums/showthread.php?t=1667453
* Thanks also to Phracturedblue and his deviation firmware
**********************************
*/