Reciprocal licenses

Reciprocal licenses, also known as copyleft licenses, include for instance the following licenses:

For open source software:
- Strong copyleft licenses GPL-3.0-only, and AGPL-3.0-only
- Weak copyleft licenses: LGPL-3.0-only, EUPL-1.2, and MPL-2.0
For open data or databases CC-By-SA 4.0, and ODbL-1.0
For open hardware CERN OHL, and TAPR

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