The built-in escape filter only works with certain characters. It works great in environments where you can declare your charset (UTF-8). However, not everything can handle anything outside of the ASCII charset. This replaces all non-ASCII characters with their encoded value as `®` for ®, for example.
Django has several filters designed to sanitize HTML output, but they're either too broad (striptags, escape) or too narrow (removetags) to use when you want to allow a specified set of HTML tags in your output. Thus keeptags was born. Some of the code is essentially ripped from the Django removetags function. It's not perfect--for example, it doesn't touch attributes inside elements at all--but otherwise it works well.
Works just like the normal template filter, escape(), except that it works on dictionaries and lsits
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