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LibRaw is licensed in triple

LibRaw is licensed in triple-licensing form:
- or CDDL
- or LibRaw own license (to be dropped in 0.18-release, because all signed agreements has ended).

You (app developer) is free to choose license (from LGPL/CDDL if you wish to use LibRaw 0.18 when we'll release it) that suits you best.

In short:

LGPL2 allows use in Commercial App if you use Library (LibRaw in this case) as shared-library and has published in open-source (under LGPL2) any changes you made to Library source. If you use LibRaw unmodified, you only need to use it in shared-library form (.DLL/.so/.dylib)

CDDL is more permissive, you may just use the library and do not forced to publish your changes to it.

Attribution is needed in both cases. Written/signed form is not needed.

-- Alex Tutubalin @LibRaw LLC