The following is a list of reference ESA open Software Licenses (original location at https://essr.esa.int/license/list)
Active ESA Licenses
These licenses cover the cases of real Open Source licenses (open to everybody) as well as Community Licenses (open to ESA member states only) with varying degree of copyleft.
Previously used ESA Licenses
| Document | Version | Download | Remark |
|---|---|---|---|
| European Space Agency Public License – Type 1 | 2.3 |  | Strong Copyleft |
| European Space Agency Public License – Type 2 | 2.3 | | Weak Copyleft |
| European Space Agency Public License – Type 3 | 2.3 | | Permissive |
| ESA Software Community License – Type 1 | 2.3 | | Strong Copyleft |
| ESA Software Community License – Type 2 | 2.3 | | Weak Copyleft |
| ESA Software Community License – Type 3 | 2.3 | | Permissive |
| European Space Agency Public License – Type 1 | 2.1 | | |
| European Space Agency Public License – Type 2 | 2.1 | | Does not allow relink |
| European Space Agency Public License – Type 2 | 2.1 | | Allows relink |
| European Space Agency Public License – Type 3 | 2.1 | | |
| ESA Software Community License – Type 1 | 1.1 | | |
| ESA Software Community License – Type 2 | 1.1 | | Does not allow relink |
| ESA Software Community License – Type 2 | 1.1 | | Allows relink |
| ESA Software Community License – Type 3 | 1.1 | |