What is Open Source Software ?


Freely Redistributable
Includes Program Source
Variety of Licensing Schemes
GPL, LGPL, BSD, MPL, Artistic, ...
Examples of Open Source Software:
Perl, BIND, INN, Apache, Sendmail, ...
Examples of Not Open Source Software:
Freeware
Usually does not include source or permit modifications
Shareware
Usually does not include source and requires payment
Commercial or Proprietary Software
Source is typically unavailable or access restricted