# CNS License Issues for Using HADDOCK3

**URL:** <https://ask.bioexcel.eu/t/cns-license-issues-for-using-haddock3/6218>\
**Category:** HADDOCK\
**Tags:** support\
**Created:** [July 31, 2026, 10:03am UTC](https://ask.bioexcel.eu/t/cns-license-issues-for-using-haddock3/6218 "2026-07-31T10:03:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ben1992](https://avatars.discourse-cdn.com/v4/letter/b/a8b319/32.png) [@ben1992](https://ask.bioexcel.eu/u/ben1992)\
**Post date:** [July 31, 2026, 10:03am UTC](https://ask.bioexcel.eu/t/cns-license-issues-for-using-haddock3/6218/1 "2026-07-31T10:03:27Z")

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The HADDOCK category is meant to discuss any HADDOCK-related issue. For general information about HADDOCK refer to [HADDOCK – Bonvin Lab](http://www.bonvinlab.org/software/haddock2.4)

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I inquired with Biovia (3DS) about licensing in accordance with [haddock3/DISCLAIMER.md at main · haddocking/haddock3 · GitHub](https://github.com/haddocking/haddock3/blob/main/DISCLAIMER.md) , but was informed that CNS is not a product managed by Biovia.  
We intend to use HADDOCK3 for antibody development and docking simulations within our company; how can we purchase or request a license for CNS?

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**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\
**Post date:** [July 31, 2026, 10:48am UTC](https://ask.bioexcel.eu/t/cns-license-issues-for-using-haddock3/6218/2 "2026-07-31T10:48:01Z")

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CNX is the version they used to distribute, but no longer do so. Officially as far as I know Biovia still holds the license for commercial use for CHARMM and all derivatives, which includes CNS.

From the info I have, they would require you to purchase their homology modelling packages, which would entitle you to use the non-profit CNS version.

You of course need to get into contact with people from Biovia who know about this. I have a few names I can share via email if you send me an email

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**Author:** ![ben1992](https://avatars.discourse-cdn.com/v4/letter/b/a8b319/32.png) [@ben1992](https://ask.bioexcel.eu/u/ben1992)\
**Post date:** [August 5, 2026, 1:06am UTC](https://ask.bioexcel.eu/t/cns-license-issues-for-using-haddock3/6218/3 "2026-08-05T01:06:43Z")

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Thank you very much for the clarification. This information is very helpful.

I will contact BIOVIA directly and inquire further about the appropriate commercial licensing route for CNS in connection with our use of HADDOCK3.

Thank you again for your assistance.