The file https://github.com/jakartaee/rest/blob/4.0.0/jaxrs-api/src/main/java/jakarta/ws/rs/core/EntityPart.java is under the Eclipse Foundation Specification License v1.0.
This license has different requirements for the distribution of a specification document/file and software that implements the specification.
What is the case with EntityPart.java? Specification or implementation? In the case this is an implementation of a specification: what is the link to the specification document?