We formalize a wide variety of Volpano/Smith-style noninterference
notions for a while language with parallel composition.
We systematize and classify these notions according to
compositionality w.r.t. the language constructs. Compositionality
yields sound syntactic criteria (a.k.a. type systems) in a uniform way.
about these proofs is published in the proceedings
of the conference Certified Programs and Proofs 2012.