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  AUTHENTICITY VERIFICATION FEATURE

  The Authenticity Verification information you receive from PKWARE will
  include two AV Serial Numbers and one checksum.  The Serial Numbers
  include BOTH letters and numbers.  ALL LETTERS in the Serial Numbers are
  LOWER CASE.

  After both Serial Numbers are entered using the PUTAV.EXE, the program
  will return a checksum value.  This checksum must match the one provided
  by PKWARE.  If the checksums do not match, then the installation was not
  performed correctly and PUTAV.EXE should be run again to ensure that the
  Serial Numbers and Name were entered correctly.

  If you run PUTAV.EXE and you encounter the error, "ERROR IN PKZIP.EXE",
  verify that you are running PUTAV on the registered version of PKZIP.EXE.


  AVEXTRA.TXT

  With the PKZIP 2 Authenticity Verification feature, additional text can be
  displayed on subsequent lines following the verification message.  An
  ASCII text file named AVEXTRA.TXT is created containing the additional
  text you want displayed.  When the AVEXTRA.TXT file is in the current
  directory when you use the "PKZIP -!" option, PKZIP will add this text to
  the .ZIP file and PKUNZIP will display it after the normal Authenticity
  Verification message.  The Authenticity Verification feature is available
  only to registered users of PKZIP.