The SignWriting script is the product of a process that is already under way for over 30 years. It is a process that has been getting more and more momentum.
The script has been available on line for everyone to use from the start. When people have questions, need support, it has always been provided. People are learning to write their sign language all over the world. The last time I spoke to Valerie Sutton, the creator of the SignWriting script, it had to be short because people from Switzerland wanted to talk to her :)
As the SignWriting movement is ancient in Internet time, it started before licenses and copyright were considered. People needed to be able to use it, so it was made available. In a reply to a previous post on the subject of SignWriting, David Gerard asked about the license and the copyright and asked if there is an organisation behind SignWriting.
Yes, there is an organisation, the "Center for Sutton Movement Writing Inc." which is a USA nonprofit, tax-exempt educational membership organization. The copyright I understand is with Valerie Sutton and, she is considering what license to use. I have been discussing this with Valerie and the license that we are considering is the SIL Open Font License.
The big question she asked me to ask David and my readers is: "If all SignWriting symbols were under the SIL Open Font License (OFL) would you feel free to use the symbols?"