Good explanation here: https://perens.com/2017/02/14/bsl-1-1/ https://perens.com/2017/02/14/bsl-1-1/ It’s from the day that the code is released under the lice

Good explanation here: https://perens.com/2017/02/14/bsl-1-1/ https://perens.com/2017/02/14/bsl-1-1/ It’s from the day that the code is released under the license and the four years is the max under BSL (so that people know roughly what the “worst case scenario” it a BSL licensed software would be) but can be specified to be shorter by the one releasing code under it.