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# CERN Open Hardware Licence
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The CERN Open Hardware Licence (CERN OHL) was originally written for
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CERN designs hosted in the OHR.
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The CERN OHL can also be used by any designer wishing to share design
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information using a licence compliant with the [OSHW definition
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criteria](http://freedomdefined.org/OSHW).
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Myriam Ayass, legal adviser of the Knowledge and Technology Transfer
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Group at CERN and author of the CERN OHL:
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\> In the spirit of knowledge sharing and dissemination, the CERN Open
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Hardware Licence (CERN OHL) governs the use, copying, modification and
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distribution of hardware design documentation, and the manufacture and
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distribution of products.
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\>
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\> The CERN–OHL is to hardware what the General Public Licence (GPL) is
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to software. It defines the conditions under which a licensee will be
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able to use or modify the licensed material. The concept of ‘open-source
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hardware’ or ‘open hardware’ is not yet as well known or widespread as
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the free software or open-source software concept. However, it shares
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the same principles: anyone should be able to see the source (the design
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documentation in case of hardware), study it, modify it and share it.
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\>
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\> In addition, if modifications are made and distributed, it must be
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under the same licence conditions – this is the ‘persistent’ nature of
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the licence, which ensures that the whole community will continue
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benefiting from improvements, in the sense that everyone will in turn be
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able to make modifications to these improvements.
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The CERN Open Hardware Licence was originally written for CERN designs
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hosted in the Open Hardware Repository. It can also be used by any
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designer wishing to share design information using a licence compliant
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with the [OSHW definition criteria](http://freedomdefined.org/OSHW).
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## CERN Open Hardware Licence
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| ... | ... | @@ -12,11 +33,29 @@ criteria](http://freedomdefined.org/OSHW). |
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- This document contains two files: the licence itself and a guide
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to its usage.
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- Some [ideas](CernOhlIdeas) we are considering for the next version.
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- [Example of usage](https://www.ohwr.org/project/spec/wikis/documents)
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- [Example of usage](https://www.ohwr.org/project/spec/wikis/documents) in the
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[Simple PCIe FMC carrier
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project](https://www.ohwr.org/project/spec).
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## CERN OHL Users
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- [Projects using the CERN Open Hardware Licence](CernOhlProjects)
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- [Projects using the CERN Open Hardware Licence.](CernOhlProjects)
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## What CERN writes about OHR (the site) and OHL (the licence)
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- CERN Courier: [*Hardware joins the open
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movement*](http://cerncourier.com/cws/article/cern/46054) (June
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2011)
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- CERN Bulletin: [*Open hardware for open
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science*](http://cdsweb.cern.ch/journal/CERNBulletin/2011/28/News%20Articles/1357331?ln=en)
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(July 2011)
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- CERN Press Release: [*CERN launches Open Hardware
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initiative*](http://press.web.cern.ch/press/PressReleases/Releases2011/PR08.11E.html)
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(July 2011)
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## See also
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- [OHR Meta project](https://www.ohwr.org/project/ohr-meta)
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-----
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| ... | ... | |
