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Weak copyleft

European Union Public Licence 1.2

An EU-origin copyleft license designed for public-sector and interoperable software, with multilingual authentic texts.

Compared to common options: EU-focused copyleft with compatibility provisions; not a drop-in MIT/Apache substitute — read EUPL compatibility notes.

Generally allows

  • Commercial use
  • Modification
  • Distribution
  • Communication to the public
  • Private use

Typically requires

  • Provide source when distributing or communicating the work
  • Retain notices
  • License derivatives under EUPL or a compatible license listed by the EUPL

Watch-outs

  • Removing copyright notices
  • Holding authors liable beyond the licence terms

How teams usually use it

  1. Relevant for European public administrations and projects targeting EU interoperability.
  2. Read the compatibility provisions before combining EUPL code with other copyleft licenses.
  3. Use official EUPL texts and supporting material from Interoperable Europe / Joinup rather than unofficial summaries.
Official & reference sources

Orientation only — not legal advice. Always verify the repository LICENSE file, notices, and dependency terms, and obtain counsel for commercial distribution decisions.

Projects declared under EUPL-1.2.

Inspect repositories, stacks, activity, and alternatives across catalog projects that declare EUPL-1.2.

2 projects connectedAlways verify the repository LICENSE file and obtain legal advice when needed.
DCAT Catalog Check
GermanyEUPL

validate links and formats in a DCAT catalog.

Developer ToolsOpen-source projects grouped in this category for discovery and comparison.2 projects#linuxProjects tagged with this topic in the verified catalog.2 projectsmetadata-validationProjects tagged with this topic in the verified catalog.1 projectLinuxDocumented runtime or deployment platform for this open-source project.2 projects
DEDE - Open CodeFederated from DE - Open Code (Germany) in the EU Open Source Solutions Catalogue. Software type: Standalone/Other.Stable · Metadata Validation · Data Quality ToolsStableStableMarked Stable in the EU OSS Catalogue: considered ready for production use by the publishing public administration.EU OSS Catalogue maturity
160/100Vitality 60/100Healthy activity. The EU OSS Catalogue vitality index (0–100) is an AGID-compatible score of recent repository activity—commits, releases, and contributor signals—not a quality or security rating.EU OSS Catalogue · AGID-compatibleActivity unavailable
Open sourceIndependent project
CSW2DCAT-Bridge
GermanyEUPL

Server application for translating ISO metadata of a CSW results to DCAT-AP.de and providing a DCAT catalog endpoint.

Developer ToolsOpen-source projects grouped in this category for discovery and comparison.2 projects#linuxProjects tagged with this topic in the verified catalog.2 projectsmetadata-managementProjects tagged with this topic in the verified catalog.1 projectLinuxDocumented runtime or deployment platform for this open-source project.2 projects
DEDE - Open CodeFederated from DE - Open Code (Germany) in the EU Open Source Solutions Catalogue. Software type: Standalone/Other.Stable · Metadata Management · Data IntegrationStableStableMarked Stable in the EU OSS Catalogue: considered ready for production use by the publishing public administration.EU OSS Catalogue maturity
065/100Vitality 65/100Healthy activity. The EU OSS Catalogue vitality index (0–100) is an AGID-compatible score of recent repository activity—commits, releases, and contributor signals—not a quality or security rating.EU OSS Catalogue · AGID-compatibleActivity unavailable
Open sourceIndependent project
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