Libre systems are open and free, and you can use them without having restrictions now or in the future. This is a great attribute, because any investment on a proprietary system can be wasted if the owner decide to change their policies and, for example, start charging all users or trainers a large amount of money to allow them to proceed using what they have created based on the proprietary content.
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.