libp2prs-secio is used at run time in 1 crate (of which 1 optionally). It's used only as a dev dependency in 3 crates.

Depender (with downloads and own rev deps) libp2prs-secio version
libp2p-rs optional ^0.3.0
1 libp2prs-kad dev ^0.3.0
1 libp2prs-floodsub dev ^0.3.0
3 libp2prs-yamux dev ^0.3.0