How to anonymise a gps file?

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Imagine you have a GPS trace that you want to make anonymous, in the legal sense. How would you do this? Is snapping to the nearest x distance and stripping out the time enough? Are there internationally agreed standards on this? Has anyone already written an algorithm to do this? If not I plan to make a function in my evolving stplanr package to do this.

Reproducible example (using awesome rotation function from @geospacedman) from my own 'Identifiable' data:

library(rgdal)library(tmap)downloader::download("https://www.openstreetmap.org/trace/1619756/data", "test.gpx")r
 
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