Zope Public License is a free software license, used primarily for the Zope application server software. The license is similar to the well-known BSD license, however the ZPL also adds clauses prohibiting trademark use and requiring documentation of all changes.

Zope Public License
Latest version2.1
SPDX identifierZPL-1.1, ZPL-2.0, ZPL-2.1
Debian FSG compatibleYes
FSF approvedYes[1]
OSI approvedYes
GPL compatible1.0 No,[2] 2.x Yes[1]
CopyleftNo[1]
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References

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