I find information that JSON license is not campatible with GPL. I need to use OpenJDK for development on Java, and use json format for web-development. OpenJDK have components for working with JSON and it was licensed under GPLv2 with linking exception.
So can I use json format on my projects, that will be distributed under GPL? Why JSON license is uncompatible with GPL, but json format using in GPL licensed project like OpenJDK?
Or I mistake and it about only original implementation of JSON and not about other implementation of encoders and decoders?