The EU Article 29 Working Party have issued their Opinion 1/2010 on the concepts of "controller" and "processor" under the EU Data Protection Directive.
The concepts of "data controller" and "data processor" are very tricky concepts which can trip people up or get in the way, so the opinion is very well worth reading.
I've only just seen it and wanted to post this heads up, I've not read it yet myself.
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