The Tigase ACS is only available under a commercial license.
The full text of the commercial license agreement is available upon request.

The Tigase ACS component is provided free of charge for testing and
development purposes only. Any use of the component on production systems,
either commercial or not-for-profit, requires the purchase of a license.

If the Tigase ACS component is activated without a valid license, it will
continue to work, including its full set of features, but it will send
certain statistical information to Tigase's servers on a regular basis.
If the Tigase ACS component cannot access our servers to send information,
it will stop working. Once a valid license is installed, the Tigase ACS
component will stop sending statistical information to Tigase's servers.

By activating the Tigase ACS component without a valid license you agree
and accept that the component will send certain statistical information
(such as DNS domain names, vhost names, number of online users, number of
cluster nodes, etc.) which may be considered confidential and proprietary
by the user. You accept and confirm that such information, which may be
considered confidential or proprietary, will be transferred to Tigase's
servers and that you will not pursue any remedy at law as a result of the
information transfer.
If the Tigase ACS component is installed but not activated, no statistical
information will be sent to Tigase's servers.