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The library is dual licensed under plain BSD [1] and GPLv2 [2].

[1] https://github.com/facebook/zstd/blob/dev/LICENSE [2] https://github.com/facebook/zstd/blob/dev/COPYING

Which only makes things more confusing. Is it dual licensed, both apply? Or dual license, your choice? That only complicates the patent question further.

The GPLv2 license was added for inclusion in the kernel, you may choose either GPLv2 or BSD. See the header file https://github.com/facebook/zstd/blob/dev/lib/zstd.h.

Sweet. Would be nice if that was in the README too as it only mentions the BSD license, but the top level includes the GPL as well.

There's still the open patent question but this (i.e. BSD license) makes it easier to decide to use it.

It is mentioned at the bottom of the README, but it isn't very findable. I've opened a PR https://github.com/facebook/zstd/pull/1085.

Which got accepted (an hour after you submitted it) - nice!

Dual-licensed means buyer's choice. As the client of the library, you can use it under the terms of either license.

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