To clarify, the default copyright rules apply (which means, more or less, no copying allowed). Copyright very much applies to MIT/BSD/GPL licensed code as well

To clarify, the default copyright rules apply (which means, more or less, no copying allowed). Copyright very much applies to MIT/BSD/GPL licensed code as well. In fact, the mechanism of the GPL requiring changed+released versions to include an offer for the (modified) source code depends on copyright.