The General Data Protection Regulation (GDPR) comes into force on 25 May 2018. It regulates data protection within the European Economic Area.
To enable your users to use the "right of access", you need the unique cookieID (EID) of your user.
By using this plugin you can create a functionality on your website for your users to access their cookieID.
Webtrekk can only provide data for if you provide this ID of your user.