Zimbra Collaboration Suite (ZCS) source code is available under the terms of the Zimbra Public License (ZPL) which is derived from the Common Public License (CPL) and Mozilla Public License (MPL), and accordingly requires that modifications made to existing files, if distributed, be provided in source code form to the recipients under the same license. It also includes a clause requiring trademarks, logos, etc. be preserved making it an "attribution-style" open source license.
Categorically it is similar to the Open Source Initiative (OSI) Common Public Attribution License (CPAL).
The Free Software Foundation accepts the license as being a free software license and refers to it as being identical to the Yahoo! Public License with the exception that VMware provides the license, rather than Yahoo!.
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