>1. Code licensing is not always clear. Sometimes you are working with a code that some PhD student wrote, who left the field, whose advisor shared it with you. Can you share this code? Not necessarily... but this problem will go away with time.

Isn't it the university who owns everything? I don't know about astrophysics, but it's a big problem in engineering. Universities have been known to patent and resell research made by msc/phd student and profit from it without paying any compensation.