Source File Licensing
Individual source files within the repository MAY include a comment block at the top of the file which contains a copyright notice and reference to the license. This comment block can help to convey the license and copyright in the event that the source file gets separated from the repository. Here are some example comment blocks for many popular languages.
If your development environment / toolchain does not support the automatic application of copyright headers, consider using the copyright-notice-attacher to apply the header to common source file types.