BSD/MIT (and maybe Apache?): People can take your stuff and resell it. GPL/LGPL: People can't take your stuff and use it in any way whatsoever without making w

BSD/MIT (and maybe Apache?): People can take your stuff and resell it. GPL/LGPL: People can't take your stuff and use it in any way whatsoever without making what they make with it open source as well. That may be a broad generalization, but it's mostly true.