Permissive vs. Copyleft Open Source (opens in new tab)

The premise of copyleft licenses is attractive: Create more open source! With permissive licenses, someone can take the code and make proprietary modifications to it and sell it to other people without releasing the modifications. We want people to publish their improvements, right? With copyleft, we can force people to publish their improvements to copyleft code. Businesses will want to use our code because creating it was so much work in the first place. We need copyleft if we want more con...