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The landscape of the World Wide Web today consists of a vast amount of services. While most of them are offered for free, the service providers prohibit their malicious usage by automated scripts. To enforce this policy, Captchas have emerged as a reliable method to setup a Turing test to distinguish between human and computers. Image recognition Captchas(More)
Data warehouse (DWH) systems play an important role in the IT landscapes of today's enterprises. In order to cope with the complex transformation processes and big data volumes, they have to be supplemented by metadata. Two main uses of such metadata are data lineage analyses, allowing data elements within the DWH to be traced back to their origin, and(More)
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