Thanks for the explaination, moskyx, and thanks for looking it up, Kagarus!
So, to sum it up: RedLolly did not activate it, though it is an option for RenPy. But a (de-)compression-library used it, maybe even unintentional by RedLolly.
moskyx: Interesting compression and packaging, I must say. All the texts and scripts are uncompressed (maybe optional), but music(?) or other things may be archiched into it. That is the reason for some font-"garbage"-blocks inbetween the script.
Thanks for teaching me and please do correct me if I got something wrong.