Macaroons (http://theory.stanford.edu/~ataly/Papers/macaroons.pdf) are issued by Matrix servers as authorization tokens. Macaroons may be restricted by adding caveats to them.
`Macaroons`_ are issued by Matrix servers as authorization tokens. Macaroons may be restricted by adding caveats to them.
Caveats can only be used for reducing the scope of a token, never for increasing it. Servers are required to reject any macroon with a caveat that they do not understand.