How do I modify the footer information at the bottom of all CiviCRM pages (the one which mentions the version, link to bug tracker etc)?

Footer Info and CiviCRM Licensing As per the AGPL license, removing the footer completely is not permitted. However it is okay to modify the contents of the footer as long as you include a link to either the CiviCRM website download page or our SourceForge download site. For more specific details including any potential legal issues, please contact your friendly neighbourhood open source lawyer.

• For Drupal: In the file
  <drupal root>/modules/civicrm/templates/CRM/common/footer.tpl ...

• For Joomla:
  <joomla root>/administrator/components/com_civicrm/civicrm/templates/CRM/common/footer.tpl

Modify the last paragraph as needed keeping in mind the AGPL license requirements.