these web pages
KML files containing the public rights of way of East Sussex
The council of East Sussex provides a web page from where you can download an ESRI shape file that contains details of their public rights of way. The council also provides information about public rights of way on its online map. It may be that their map uses more up-to-date information.
An authority's Definitive Map is the authoritative source of their rights of way. The details of the public rights of way network contained in an authority's data are for information only, and are an interpretation of the Definitive Map, not the Definitive Map itself, and should not be relied on for determining the position or alignment of any public right of way. For legal purposes, an authority's data does not replace their Definitive Map. And changes may have been made to the Definitive Map that are not included in their data. The authority's data contains Ordnance Survey data © Crown copyright and database right 2013. Attempting to view this data with more detail than 1:10000 may produce an inaccurate rendering of the route of a public right of way.
When the ESRI shape file was made available to me by the council of East Sussex in 2012, it was released under terms equivalent to the Ordnance Survey OpenData Licence. When I e-mailed the Ordnance Survey about the councils that had, during the last few years, successfully obtained an exemption from the Public Sector Mapping Agreement and released their data under terms equivalent to the Ordnance Survey OpenData Licence, they replied All data exempted by Ordnance Survey is now covered by the Open Government Licence (OGL), which superseded its own OS OpenData licence in April 2015. So it's possible for you to use this data provided you say that it is public sector information released by the council of East Sussex under the Open Government Licence.
I have transformed the ESRI shape file into a KML file. However, there's a problem with this file as it has the coordinates expressed as latitude,longitude rather than longitude,latitude
From this KML file, I have produced some KML that has the order of the latitude and longitude swopped and have then converted this into the basic format that is used by this web site for all authorities. For each public right of way, this basic format has the name of the authority (East Sussex), a unique number within the authority for the public right of way, the name or number of the parish/community, the name or number of the public right of way, the type of the public right of way (i.e., footpath, bridleway, ...) and any additional information about the public right of way that I've obtained from the data supplied by the authority. Here is a link to the converted KML file for East Sussex.
This KML file has been augmented with additional information. For each public right of way, the augmented format also includes its length (in miles), the longitude and latitude of its first point, the longitude and latitude of its last point, the eastings and northings of its first point and the eastings and northings of its last point. Here is a link to the augmented KML file for East Sussex.
This web site also provides information about the public rights of way of East Sussex in GeoJSON format.