The CDDL is designed to be a per-file license. All other files in a project can be proprietary as far as it is concerned as long as the files containing CDDL co

The CDDL is designed to be a per-file license. All other files in a project can be proprietary as far as it is concerned as long as the files containing CDDL code are under the CDDL. Sun wanted it that way. The GPL's insistence that CDDL covered files be under it when they are used as part of a derived work (in the legal sense) is why incompatibility can occur.