|OSI approved||Yes or No or n/a|
|GPL compatible||Yes or No|
|Copyleft||Yes or No or Partial|
Drupal is a content management system,where it is useful for creating, managing and publishing content. Drupal is a free and open source software, it is under General Public Licence, every one has the freedom to use and freedom to share. It can be used by the people who lack in technical skills. Drupal is written in PHP language. When compared to other CMS Drupal CMS is very flexible. Drupal websites are powerful and can build large and complex websites.