By default, FIRST grants permission for standards it develops to be implemented and/or adopted by FIRST members and non-members at no cost in perpetuity. The default license for any standard is Creative Commons CC-BY-SA (Attribution+ShareAlike). Exceptions must be approved by the FIRST Board.
In case you want to use the results of a SIG, group that aims to be a standard, yes, you can use it, including the contents of the standards and any byproducts. We ask for the proper reference (Attribution) and that if you share this material, that it be shared under a similar license.
Publications and presentations from FIRST Events might have a different license applied. In case the license is not explicit, please reach out for clarification.