全景图,自由系统与专有系统
自由系统是开放且免费的，您现在和未来都可以不受限制地使用它们。这是一项重要优势，因为如果专有系统的拥有者改变政策，例如开始向所有用户或培训师收取高额费用，以允许他们继续使用基于专有内容创建的成果，那么对该专有系统的投入就可能付诸东流。
Intellectual property statements:
PRINCE2®, MSP®, and MoP® are registered trademarks of AXELOS Limited.
PMBOK® is a registered trademark of the Project Management Institute, Inc.
APM BoK is a mark of Association for Project Management.
PM² is the property of the European Union.
ICB (Individual Competence Baseline) is the property of International Project Management Association (IPMA®)
DSDM® is a registered trademark of Agile Business Consortium Limited.
LeSS is the property of The LeSS Company B.V.
SAFe® is a registered trademark of Scaled Agile, Inc.
GTD® is a registered trademark of David Allen Company.