6.x-2.5, unknown release date
- Fixed #993276; variable_set() called unconditionally in
  _htmlpurifier_load(), patch contributed by catch

6.x-2.4, released 2010-10-23
- Fixed #839490; can't find library from install profile
- Fixed #819728; make use of Filter.ExtractStyleBlocks.  Thanks
  Vector- for contributing the patch.
- Fixed #586746; Rate limit new version checks
- Fixed #764974: Give friendly error message if running under PHP4
- Deprecated Filter.YouTube in favor of SafeObject/FlashCompat.
  Thanks John Morahan for contributing the patch.

6.x-2.3, released 2010-06-09
- Fixed #819914; version never updates

6.x-2.2, released 2010-06-04
- More comprehensive cache clearing.
- Fixed #659666; clearing caches missed HTML Purifier
- Fixed #708266; decouple location of HTML Purifier library with
  libraries API.
- Fixed #783066; new HTML Purifier version message too obnoxious.

6.x-2.1, released 2009-12-12
- Ukranian translation by podarok
- Renamed dashboard to HTML Purifier Dashboard, fixes bug #368468
- Make installation process nicer by checking if library folder is setup, fixes bug #261874
- Remove unnecessary version checks

6.x-2.0, released 2008-05-18
# Drupal 6.x and HTML Purifier 3.1.0 are required
! HTML Purifier now uses its native form function, so advanced configuration
  options are available. You can also define your own custom functions
  for configuration in the config/ directory.
! Modified and better defaults selected for HTML Purifier.
- HTML Purifier now maintains its own cache with a longer expiration time;
  this helps performance greatly.
- DefinitionCache uses Drupal's caching system
- HTML Purifier will check for new versions of the core library and display
  obnoxious warnings if it is out-of-date!
- Uninstall function now obliterates HTML Purifier variables too.

1.0, released 2007-07-15 (not via Drupal.org)
- Initial release, basic functionality implemented.