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-README.geoip -- information on the IP-to-country-code file shipped with tor
-===========================================================================
-
-The IP-to-country-code file in src/config/geoip is based on MaxMind's
-GeoLite Country database with the following modifications:
-
- - Those "A1" ("Anonymous Proxy") entries lying inbetween two entries with
-   the same country code are automatically changed to that country code.
-   These changes can be overriden by specifying a different country code
-   in src/config/geoip-manual.
-
- - Other "A1" entries are replaced with country codes specified in
-   src/config/geoip-manual, or are left as is if there is no corresponding
-   entry in that file.  Even non-"A1" entries can be modified by adding a
-   replacement entry to src/config/geoip-manual.  Handle with care.
-
-
-1. Updating the geoip file from a MaxMind database file
--------------------------------------------------------
-
-Download the most recent MaxMind GeoLite Country database:
-http://geolite.maxmind.com/download/geoip/database/GeoIPCountryCSV.zip
-
-Run `python deanonymind.py` in the local directory.  Review the output to
-learn about applied automatic/manual changes and watch out for any
-warnings.
-
-Possibly edit geoip-manual to make more/fewer/different manual changes and
-re-run `python deanonymind.py`.
-
-When done, prepend the new geoip file with a comment like this:
-
-  # Last updated based on $DATE Maxmind GeoLite Country
-  # See README.geoip for details on the conversion.
-
-
-2. Verifying automatic and manual changes using diff
-----------------------------------------------------
-
-To unzip the original MaxMind file and look at the automatic changes, run:
-
-  unzip GeoIPCountryCSV.zip
-  diff -U1 GeoIPCountryWhois.csv AutomaticGeoIPCountryWhois.csv
-
-To look at subsequent manual changes, run:
-
-  diff -U1 AutomaticGeoIPCountryWhois.csv ManualGeoIPCountryWhois.csv
-
-To manually generate the geoip file and compare it to the automatically
-created one, run:
-
-  cut -d, -f3-5 < ManualGeoIPCountryWhois.csv | sed 's/"//g' > mygeoip
-  diff -U1 geoip mygeoip
-
-
-3. Verifying automatic and manual changes using blockfinder
------------------------------------------------------------
-
-Blockfinder is a powerful tool to handle multiple IP-to-country data
-sources.  Blockfinder has a function to specify a country code and compare
-conflicting country code assignments in different data sources.
-
-We can use blockfinder to compare A1 entries in the original MaxMind file
-with the same or overlapping blocks in the file generated above and in the
-RIR delegation files:
-
-  git clone https://github.com/ioerror/blockfinder
-  cd blockfinder/
-  python blockfinder -i
-  python blockfinder -r ../GeoIPCountryWhois.csv
-  python blockfinder -r ../ManualGeoIPCountryWhois.csv
-  python blockfinder -p A1 > A1-comparison.txt
-
-The output marks conflicts between assignments using either '*' in case of
-two different opinions or '#' for three or more different opinions about
-the country code for a given block.
-
-The '*' conflicts are most likely harmless, because there will always be
-at least two opinions with the original MaxMind file saying A1 and the
-other two sources saying something more meaningful.
-
-However, watch out for '#' conflicts.  In these cases, the original
-MaxMind file ("A1"), the updated MaxMind file (hopefully the correct
-country code), and the RIR delegation files (some other country code) all
-disagree.
-
-There are perfectly valid cases where the updated MaxMind file and the RIR
-delegation files don't agree.  But each of those cases must be verified
-manually.
-