The 3MF specification document clearly defines the following:
- The standard, mandatory parts of the spec
- The optional parts of the spec
- Areas where proprietary information can be added to a 3MF file
The specification also sets a baseline that can be used for adding new capabilities in the future.
3MF members have agreed to make their necessary patent claims available for implementations of the 3MF Core Specification and 3MF Materials Specification on a royalty-free basis. For details, please review the Joint Development Foundation Working Group Charter Appendix A, Patent Policy Option 2, available at http://bit.ly/1KqwpFU.