The Mozilla Public License 1.1 (MPL 1.1)
In January, 1998, Netscape Communications decided to release the binary code of its Communicator web-brower for free. Less than 24 hours later, it decided to release the Communicator source code as well. As a result, at the same time that Netscape was addressing the many technical problems with transitioning Communicator into open source (including removing substantial amounts of code written by third parties who were unwilling to have their code "open sourced"), Netscape had to address the complex licensing issues involved.[14]
The Netscape Public License (NPL) and the Mozilla Public License (MPL) were the result of these efforts.[15] The NPL was substantially similar to the MPL, but it reserved certain rights to Netscape, most importantly, the right on the part of Netscape to relicense code developed by third parties that is derived from Communicator code under a proprietary or other license. Third-party modifiers of NPL-licensed code could thus lose any benefits that might flow from their contributions, without the guarantee, as for instance under the GPL, that their code will remain available to the community of programmers. The MPL does not contain the particular provisions embodying this grant of rights to Netscape.
The MPL constitutes an interesting hybrid of the ideas of the GPL and the BSD licenses already described. While code that falls within the scope of what the license describes as "Covered Code" is subject to many of the restrictions ...
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