Proprietary software, unlike open source software, does not allow for free distribution of source code.
Criticism of proprietary software includes arguments that it locks users in to a vendor, it’s too expensive, or it may be a security risk as it’s not clear what the software does.
Some open source projects dual license their software under a proprietary license in order to allow users to escape licensing conditions, such as the GNU General Public License’s copyleft clause. Notable examples of this are MySQL and Sendmail.
In many cases, open source software is a response to proprietary software, creating a version of a project with the ability to freely modify and distribute as a feature. For example, Linux was developed and championed as a free alternative to proprietary UNIX systems.
JIRA is a proprietary bug tracking system written in J2EE by Atlassian Software, who also make the proprietary wiki Confluence.
Both of the products, while proprietary and available under commercial licensing terms, are freely licensed by Atlassian to open source projects and non-profits. These people may contact Atlassian to obtain the free license.
JIRA supports various features, including RSS, however RSS feeds in JIRA must be appended with “os_username=name&os_password=pass”, to generate an authentication token for a secured JIRA server.
See Also
Bugzilla – a free and open source bug tracking solution used by high profile projects such as Tomcat and Mozilla.