So the key is to download the source for each version you use and record the date and the current license text. Also, use the oldest version you're comfortable

So the key is to download the source for each version you use and record the date and the current license text. Also, use the oldest version you're comfortable with since it converts the soonest. I'm thinking for down the road when new releases are under a different (even commercial) license and the pull the source for old versions. Then cost starts to go up a lot. Not saying it will, but I hope the software is successful but that sometimes leads to bad things for customers.