The following terms are based on the definitions used in The Apache Software Foundation's Third-Party Licensing Policy.
A form of a work not typically used for making modifications, including executables, object code and libraries.
A work that is licensed under the legal right of the copyright holder, where the licensee is given the right to use the work under certain conditions, and restricted from using it in other ways. Such restricted activities may include: modification; redistribution; or reverse engineering.
The preferred form of a work for making modifications.
Any work that has not been contributed by you or (in the context of business) your company.
The licence applying to a third-party work.