A Green Paper is a discussion document. This Green Paper on Postal Services is published as the basis for discussion of what changes need to be made to the Community′s postal sector in order to achieve the Single Market in postal services.
2002, Milton Mueller, Ruling the Root: Internet Governance and the Taming of Cyberspace, page 164:
Between the release of the Green Paper in late January 1998 and the issuance of the final White Paper in June 1998, a subset of the groups listed in table 8.1 formed a “dominant coalition” capable of driving the institutionalization process to conclusion.
(Canada) An official document sponsored by the Crown of propositions put before the nation for discussion.