Writing "licence"

At CERN, there are two official languages: French and UK English. When writing about open source, we often discuss licensing. Licence as a noun is written with a c in UK English, and with an s in US English (license). As a verb though, it is written with an s in both US and UK English. So, using UK English, we could write: I am going to license my hardware design using the CERN Open Hardware Licence.

We do respect the US English spelling of license the noun when it is part of a standard well-accepted expression, such as Contributor License Agreement (CLA) or when quoting from third parties (e.g. the terms and conditions of GitHub).