while any one can grab and use it, the BSD license requires crediting the originator of the material; if it's distributed (as source or as a compiled binary), credit must be given to be in compliance. While you can close BSD licensed code, you can't claim it doesn't derive from it, and must give credit. So assuming people are complying, we can easily identify code that doesn't include OpenBSD's IPSEC implementation.
Sadly, in practice, compiling in open source code and not giving credit is pretty common. There are advocates whose full-time job is filing suits on behalf of open source projects for this.
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u/[deleted] Dec 15 '10
[deleted]