自由软件的4个freedom

今天看了Richard Stallman 2005北京行的视频，对4个freedom最有感触
“……user has four essential freedoms.
Freedom zero
is the freedom to run the program as you wish.
Freedom one
is the freedom to help yourself, that's the freedom to study the source code of
the program and change it to what you wish.
Freedom two
is the freedom to help your neighbour, that's the freedom to make copies and
distribute them to others. And
Freedom three
is the freedom to help your community, that's the freedom to distribute modified
versions when you wish. ”