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Libaec includes a free drop-in replacement for the SZIP library. Just replace SZIP's shared library libsz.so* with libaec.so* and libsz.so* from libaec.
For Windows the DLLs are called SZIP.DLL and AEC.DLL. Code which is dynamically linked with SZIP such as HDF5 should continue to work with libaec. No re-compilation required!
HDF5 files which contain SZIP encoded data can be decoded by HDF5 using libaec and vice versa.