> But that's "source code available", not "open source" (ie, under a copyleft license) It's proprietary. Also, there are many free software (or "open source" i

> But that's "source code available", not "open source" (ie, under a copyleft license) It's proprietary. Also, there are many free software (or "open source" if you prefer) licenses that are not copyleft. MIT, Apache, Revised BSD, zlib, etc are all examples.