Feed Ars Technica: Feature: Advertisers get hands stuck inside HTML5 database cookie jar (arstechnica.com)
Even casual Internet users know that if you want to hold your privacy in check, it's good practice to clear out your browser cookies every once in a while. Our recent coverage about "zombie" Flash cookies has shown us, however, that simply clearing your browser cookies the old fashioned way isn't always enough. As highlighted by a study out of UC Berkeley, some companies have begun using Flash-based cookies that not only recreate themselves when deleted without the user's knowledge, they reach into the Flash storage bin for the just-deleted user info so that they can keep tracking you and your stored history instead of starting anew.
It's because of this behavior that some of our readers drew our attention to something called RLDGUID, a Safari database that has been popping up more and more on iOS devices. What is it, who put it there, and what purpose does it serve? The company behind this database, Ringleader Digital, is basically using some of the modern HTML5 capabilities of mobile browsers to perform the same tasks as a traditional cookie, but out of sight of most users. We decided to dig in and see what RLDGUID is all about, and what we found was sometimes confusing. More importantly, however, it highlights why users should be made more aware of what their browsers are storing about them.
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