# The usage of ITK patented code

**URL:** https://discourse.itk.org/t/the-usage-of-itk-patented-code/3628
**Category:** Engineering
**Created:** [November 16, 2020, 7:54pm UTC](https://discourse.itk.org/t/the-usage-of-itk-patented-code/3628 "2020-11-16T19:54:42Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Nayra\_Ahmed](https://discourse.itk.org/user_avatar/discourse.itk.org/nayra_ahmed/32/1439_2.png) [@Nayra\_Ahmed](https://discourse.itk.org/u/Nayra_Ahmed)
#### Post date: [November 16, 2020, 7:54pm UTC](https://discourse.itk.org/t/the-usage-of-itk-patented-code/3628/1 "2020-11-16T19:54:42Z")

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I am trying to build an old version of ITK to use the patented code in it.  
I am building ITK-3.20 and I enabled the generation of the patented code but I still cannot use it.  
So I have two questions here:  
First: Any advice on how to use the patented code in a correct way ?  
Second : How can I get the license of the patented ITK code ?

Any help is appreciated.  
Thanks in advance.  
Best Regards,  
Nayra

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### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [November 17, 2020, 2:15pm UTC](https://discourse.itk.org/t/the-usage-of-itk-patented-code/3628/2 "2020-11-17T14:15:40Z")

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> [@Nayra\_Ahmed](#):
>
> still cannot use it

What does this mean?

Correct use of patented code is to pay licensing fee to the patent owner, then use it just like any other code.

As the classes generally don’t contain patent information, you will have to search on your own who the patent owner is, and whether that patent has expired. If it has expired, the code can be used freely.