Merging upstream version 1.6~rc1.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

1 files changed, 37 insertions, 4 deletions

diff --git a/README b/README
index fe86adf..a7cbbd2 100644
--- a/README
+++ b/README
@@ -6,17 +6,50 @@ the one of lzip, bzip2 or gzip.
 Pdlzip uses the lzip file format; the files produced by pdlzip are
 (hope)fully compatible with lzip-1.4 or newer. Pdlzip is in fact a
 "public domain" version of the lzip data compressor, intended for those
-who can't distribute GPL licensed Free Software.
+who can't distribute (or even use) GPL licensed Free Software.
+
+The lzip file format is designed for data sharing and long-term
+archiving, taking into account both data integrity and decoder
+availability:
+
+   * The lzip format provides very safe integrity checking and some data
+     recovery means. The lziprecover program can repair bit-flip errors
+     (one of the most common forms of data corruption) in lzip files,
+     and provides data recovery capabilities, including error-checked
+     merging of damaged copies of a file.
+
+   * The lzip format is as simple as possible (but not simpler). The
+     lzip manual provides the code of a simple decompressor along with a
+     detailed explanation of how it works, so that with the only help of
+     the lzip manual it would be possible for a digital archaeologist to
+     extract the data from a lzip file long after quantum computers
+     eventually render LZMA obsolete.
+
+   * Additionally the lzip reference implementation is copylefted, which
+     guarantees that it will remain free forever.
+
+A nice feature of the lzip format is that a corrupt byte is easier to
+repair the nearer it is from the beginning of the file. Therefore, with
+the help of lziprecover, losing an entire archive just because of a
+corrupt byte near the beginning is a thing of the past.
 
 Pdlzip is also able to decompress legacy lzma-alone (.lzma) files.
+Lzma-alone is a very bad format. If you keep any lzma-alone files, it is
+advisable to recompress them to lzip format.
 
 Pdlzip is written in C.
 
-Pdlzip includes public domain compression code from the LZMA SDK written
-by Igor Pavlov.
+Pdlzip includes public domain (de)compression code from the LZMA SDK
+(Software Development Kit) written by Igor Pavlov.
+
+I would not write non-copylefted software unless it is too simple to be
+worth copylefting it, but one of the uses of the lzip format is the
+interchange of information, and it is therefore desirable that even the
+users of the most non-free platforms can share lzip files with everybody
+else.
 
 
-Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
+Copyright (C) 2010-2015 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute and modify it.