Open source doesn't just mean access to the source code.
The distribution terms of open-source software must comply with the following criteria:
- Free Redistribution
The license shall not restrict any party from selling or giving away the software
as a component of an aggregate software distribution
containing programs from several different sources.
The license shall not require a royalty or other fee for such sale.
- Source Code
The program must include source code, and must allow distribution in source code as well as compiled form.
Where some form of a product is not distributed with source code,
there must be a well-publicized means of obtaining the source code
for no more than a reasonable reproduction cost
preferably, downloading via the Internet without charge.
The source code must be the preferred form in which a programmer would modify the program.
Deliberately obfuscated source code is not allowed.
Intermediate forms such as the output of a preprocessor or translator are not allowed.
- Derived Works
The license must allow modifications and derived works,
and must allow them to be distributed under the same terms as the license of the original software.
- Integrity of The Author's Source Code
The license may restrict source-code from being distributed in modified form
only if the license allows the distribution of "patch files" with the source code
for the purpose of modifying the program at build time.
The license must explicitly permit distribution of software built from modified source code.
The license may require derived works to carry a different name or version number
from the original software.
- No Discrimination Against Persons or Groups
The license must not discriminate against any person or group of persons.
- No Discrimination Against Fields of Endeavor
The license must not restrict anyone from making use of the program
in a specific field of endeavor.
For example, it may not restrict the program from being used in a business,
or from being used for genetic research.
- Distribution of License
The rights attached to the program must apply to all to whom the program is redistributed
without the need for execution of an additional license by those parties.
- License Must Not Be Specific to a Product
The rights attached to the program must not depend on
the program's being part of a particular software distribution.
If the program is extracted from that distribution and
used or distributed within the terms of the program's license,
all parties to whom the program is redistributed should have
the same rights as those that are
granted in conjunction with the original software distribution.
- The License Must Not Restrict Other Software
The license must not place restrictions on other software
that is distributed along with the licensed software.
For example, the license must not insist that all other programs distributed
on the same medium must be open-source software.
Copyright © 2002 by the Open Source Initiative