Legal
Creative Commons has solved this with Creative Commons licensing. Creative Commons has this one locked down. Rely on CC.
What is CC? - One Page (pdf)
Human
Creative Commons has structured this so that you and/or your project can implement the rest of the social part to this equation.
CC+ General.pdf - CC and CC+ Overview for the World Wide Web (pdf)
Concepts and Pieces
healthy ecosystem
Technical
Similar to #Human, CC has structured the Technical part of CC+ so that you can implement the technical standard to be in compliance.
CC+ Technical.pdf - CC+ Technical Implementation for the World Wide Web (pdf) explaining how to add CC+ functionality to your site.
Concepts and Pieces
RDFa and morePermissions
OpenStar