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<span class="grey"><a href="./rfc1950">RFC 1950</a>       ZLIB Compressed Data Format Specification        May 1996</span>


   2.3. Compliance

      A compliant compressor must produce streams with correct CMF, FLG
      and ADLER32, but need not support preset dictionaries.  When the
      zlib data format is used as part of another standard data format,
      the compressor may use only preset dictionaries that are specified
      by this other data format.  If this other format 