The KnowledgeTree Public License is an open source license based on the Mozilla Public License

Mozilla Public License

The Mozilla Public License is a free and open source software license. Version 1.0 was developed by Mitchell Baker when she worked as a lawyer at Netscape Communications Corporation and version 1.1 at the Mozilla Foundation...

 with additional clauses added relating to branding and copyright notice retention.

The KnowledgeTree Document Management System

KnowledgeTree

KnowledgeTree, Inc. is a provider of online document management software based in Raleigh, North Carolina. The company also has an office in Cape Town, South Africa. The company's product, also called KnowledgeTree, makes use of the cloud computing platform from Amazon EC2...

 is licensed under the KnowledgeTree Public License.

The license authors claim that this is an open source

Open source

The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...

license, but it is not officially approved as such by opensource.orghttp://www.opensource.org/licenses/.