Preamble CERN has developed this licence to promote collaboration among hardware designers and to provide a legal tool which supports the freedom to use, study, modify, share and distribute hardware designs and products based on those designs. Version 2 of the CERN Open Hardware Licence comes in three variants: CERN-OHL-P (permissive); and two reciprocal licences: this licence, CERN-OHL-W (weakly reciprocal) and CERN-OHL-S (strongly reciprocal). The CERN-OHL-W is copyright CERN 2020. Anyone is welcome to use it, in unmodified form only. Use of this Licence does not imply any endorsement by CERN of any Licensor or their designs nor does it imply any involvement by CERN in their development. 1 Definitions 1.1 'Licence' means this CERN-OHL-W. 1.2 'Compatible Licence' means a) any earlier version of the CERN Open Hardware licence, or b) any version of the CERN-OHL-S or the CERN-OHL-W, or c) any licence which permits You to treat the Source to which it applies as licensed under CERN-OHL-S or CERN-OHL-W provided that on Conveyance of any such Source, or any associated Product You treat the Source in question as being licensed under CERN-OHL-S or CERN-OHL-W as appropriate. 1.3 'Source' means information such as design materials or digital code which can be applied to Make or test a Product or to prepare a Product for use, Conveyance or sale, regardless of its medium or how it is expressed. It may include Notices. 1.4 'Covered Source' means Source that is explicitly made available under this Licence. 1.5 'Product' means any device, component, work or physical object, whether in finished or intermediate form, arising from the use, application or processing of Covered Source. 1.6 'Make' means to create or configure something, whether by manufacture, assembly, compiling, loading or applying Covered Source or another Product or otherwise. 1.7 'Available Component' means any part, sub-assembly, library or code which: a) is licensed to You as Complete Source under a Compatible Licence; or b) is available, at the time a Product or the Source containing it is first Conveyed, to You and any other prospective licensees i) with sufficient rights and information (including any configuration and programming files and information about its characteristics and interfaces) to enable it either to be Made itself, or to be sourced and used to Make the Product; or ii) as part of the normal distribution of a tool used to design or Make the Product. 1.8 'External Material' means anything (including Source) which: a) is only combined with Covered Source in such a way that it interfaces with the Covered Source using a documented interface which is described in the Covered Source; and b) is not a derivative of or contains Covered Source, or, if it is, it is solely to the extent necessary to facilitate such interfacing. 1.9 'Complete Source' means the set of all Source necessary to Make a Product, in the preferred form for making modifications, including necessary installation and interfacing information both for the Product, and for any included Available Components. If the format is proprietary, it must also be made available in a format (if the proprietary tool can create it) which is viewable with a tool available to potential licensees and licensed under a licence approved by the Free Software Foundation or the Open Source Initiative. Complete Source need not include the Source of any Available Component, provided that You include in the Complete Source sufficient information to enable a recipient to Make or source and use the Available Component to Make the Product. 1.10 'Source Location' means a location where a Licensor has placed Covered Source, and which that Licensor reasonably believes will remain easily accessible for at least three years for anyone to obtain a digital copy.