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/usr/share/doc/tftpd-hpa/README is in tftpd-hpa 5.2+20150808-1ubuntu3.

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The actual contents of the file can be viewed below.

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This is tftp-hpa, a conglomerate of a number of versions of the BSD
TFTP code, changed around to port to a whole collection of operating
systems.  The goal is to work on any reasonably modern Unix with
sockets.

The tftp-hpa series is maintained by H. Peter Anvin <hpa@zytor.com>.

The latest version of this collection can be found at:

    ftp://ftp.kernel.org/pub/software/network/tftp/

See the file CHANGES for a list of changes between versions.


Please see the INSTALL and INSTALL.tftp files for compilation and
installation instructions.

===> IMPORTANT: IF YOU ARE UPGRADING FROM ANOTHER TFTP SERVER, OR FROM
===> A VERSION OF TFTP-HPA OLDER THAN 0.17 SEE THE FILE
===> "README.security" FOR IMPORTANT SECURITY MODEL CHANGES!


This software can be discussed on the SYSLINUX mailing list.  To
subscribe, go to the list subscription page at:

   http://www.zytor.com/mailman/listinfo/syslinux