Am I allowed to use file-sharing programs like bittorrent, emule or kazaa?

No.  Personal use of file-sharing programs is not permitted at CERN, as it typically involves the exchange of copyrighted material which violates the CERN Computing Rules, as set out in Operational Circular No. 5.  However, requests for professional use of file-sharing programs may be submitted to the CERN Computer Security Officer.

(file-sharing programmes)