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docs about aaxc

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README.md
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@ -235,6 +235,14 @@ __MacOS__
```
brew install mediainfo
```
## AAXC files
The AAXC format is a new Audible encryption format, meant to replace the old AAX.
The encryption has been updated, and now to decrypt the file the authcode
is not sufficient, we need two "keys" which are unique for each audiobook.
Since getting those keys is not simple, for now the method used to get them
is handled by the package audible-cli, that stores
them in a file when downloading the aaxc file. This means that in order to
decrypt the aaxc files, they must be downloaded with audible-cli.
## Audible-cli integration
Some information are not present in the AAX file. For example the chapters's
@ -254,7 +262,8 @@ chapters's title and an HQ cover: `audible download --all --aaxc --cover --cover
To make AAXtoMP3 use the additional data, specify the **--use-audible-cli-data**
flag: it expects the cover and the chapter files (and the voucher, if converting
an aaxc file) to be in the same location of the AAX file. The naming of these
files must be the one set by audible-cli.
files must be the one set by audible-cli. When converting aaxc files, the variable
is automatically set, so be sure to follow the instructions in this paragraph.
For more information on how to use the `audible-cli` package, check out the git page [audible-cli](https://github.com/mkb79/audible-cli).