The license of irrKlang is simple: You can use irrKlang for free in non-commercial products. It doesn't cost anything.
If you want to use irrKlang in a commercial product, you need to purchase an
irrKlang pro license.
The irrKlang License
irrKlang's source codes, documentation and binaries contained within the distributed archive are copyright © Nikolaus Gebhardt / Ambiera 2001-2020.
The contents of the irrKlang distribution archive may not be redistributed, reproduced, modified, transmitted, broadcast, published or adapted in any way, shape or form, without the prior written consent of the owner, Nikolaus Gebhardt.
The irrKlang.dll, irrKlang.so and libirrklang.dylib files may be redistributed without the authors prior permission in non-commercial products, and must remain unmodified except for compressing the file.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The license above does not apply to irrKlang Pro. Please take a look at the
irrKlang Pro page
for license details of that version of the sound engine.