It depends.
Both Mozilla Public License 2.0 and Eclipse Public License 2.0 are weak (file- or library-level) copyleft licenses. Combining them is usually feasible, but the obligations of each apply to its own files. Have a lawyer review if you intend to redistribute the combined work.
| License | Family | Patent grant |
|---|---|---|
| Mozilla Public License 2.0 (MPL-2.0) | weak-copyleft | Yes |
| Eclipse Public License 2.0 (EPL-2.0) | weak-copyleft | Yes |
Mozilla Public License 2.0: File-level copyleft: modifications to MPL files must be MPL, but linking with non-MPL code is fine.
Eclipse Public License 2.0: Module-level copyleft used heavily in the Java ecosystem.
If you found this page because you're trying to figure out whether shipping a particular dependency is safe, the answer above is a starting point — not a substitute for reading the actual licenses or talking to a lawyer when stakes are high.
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