"There are a lot of reasons why people make their code open
source. I believe that one of the strongest original motivations
has often been overlooked. Our hagiography tells the tale of how it
all started with the quest for software freedom. But
contemporaneous with Richard Stallman's story, other people were
taking the same path (releasing source code) for a very different
reason: the architecture of Unix.
"That architecture made two enormous contributions to the
founding of the open source movement..."