The presentation has been published that was made by José Ferrari Careto, member of the Board of Directors, at the event ''450MHZ Digitalisation 2007 - From Niche Market to Global Technology Contender'', which took place on 16 and 17 October 2007 in Lisbon and was organised by Informa Telecoms & Media. The presentation, entitled ''Regulation and Spectrum Management: challenges and trade-offs'', covered issues connected to regulation and spectrum management.