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LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

README.md

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+# tracking-query-params-registry
+
+## What Is This?
+
+Digital marketing tool such as email service providers and analytics platforms often append tracking parameters to URLs. These are helpful for marketers, but can also severely decrease the effectiveness of page caching tools such as [Varnish](https://www.varnish-cache.org/).
+
+The purpose of this repository is to keep a centralized list of tracking query parameters used by the huge range of online marketing tools in use today.
+
+## The List
+
+{% include table.html %}
+
+The lists is contained in [params.csv](https://github.com/mpchadwick/tracking-query-params-registry/blob/master/_data/params.csv). The file contains 4 columns...
+
+- **Param** This is the query parameter appended to URLs
+- **Platform** This is the platform that is responsible for appending this parameter
+- **Confirmed In** A reference to the query parameter
+- **Unique Per Visitor** Whether or not the parameter is unique for each visitor
+
+The intention is to use this list to form an ignore list for your page cache implementation.
+
+## Contributing
+
+If you come across a tracking parameter that is missing from this list, by all means, make a contribution. In order to do so, please fork the repository and issue a pull request to the master branch. Please include the "Confirmed In" column to show where this query parameter is referenced.