We set the following first-party cookies on our own domains when you open one of our links or pages.
A random browser identifier that lets us recognise the same browser across our links. It lasts 28 days and can be read by pages on our domains.
A random code that tracks your visit from an ad to the page it led to. It is kept for 28 days. Scripts on the page cannot read it.
When a link takes you to another website, we usually add both identifiers to that website's address, together with a signature and an expiry time, so that a sign-up there can be credited to the campaign.
A session cookie and a security token that protect requests to our pages. They last up to 30 days.
Our site statistics script keeps the same browser identifier in its own cookie or in browser storage on our domains so that we can count visits.
We do not set third-party cookies and we do not use cookies for advertising on other sites.