Earlier this week, Dan Blanchard, maintainer of a Python character encoding detection library called chardet, released a new version of the library under a new software license. In doing so, he may have killed "copyleft." Version 7.0 employs an MIT license in place of the previous GNU Lesser General Public License (LGPL). Developers who have an eye on commercial use of their open source works tend to prefer permissive licenses like MIT’s because they impose fewer obligations than copyleft licens...