Introduction.- Part I   Providing cybersecurity as a new challenge  for governments.- Cyberspace and cybersecurity.- Cyberspace as an area of legal regulation.- Cyberspace, cybercrime, cyberterrorism (F. Radoniewicz).- International regulations of cybersecurity  (F. Radoniewicz.- Cybersecurity in the European Union law.- National Cybersecurity System Act.- The New National Security Strategy of the Republic of Poland.- The Cybersecurity Strategy of the Republic of Poland.-  The functioning of state power structures and cybersecurity.- Personal data protection in the context of the Act on the National Cybersecurity System.- Space security and cybersecurity in Poland.- Part II   Competences, obligations and tasks of entities  responsible for ensuring cybersecurity under the  national cybersecurity system ("imperious entities").- Cybersecurity as a public task in administration.- The authorities competent for cybersecurity.- The main tasks of the network of Computer Security Incident Response Teams in the light of the Act on the National Cybersecurity System in Poland.- Tasks of the Minister of National Defence in the field of cybersecurity.- Role of the minister competent for computerisation in the cybersecurity system.- The duties and legal status of the Government Plenipotentiary  for Cybersecurity and the College  for Cybersecurity.- Part III  Obligations of other entities included in the national  cybersecurity system („participants"  of the national cybersecurity system).- Tasks of operators of essential services and digital service providers .- The obligations of public entities.- The system of control and supervision of operators of essential services,  digital service providers and entities providing cybersecurity services.- Monetary penalties in  the National Cybersecurity System Act.- The liability of entities providing services by electronic means for digital content.- Part IV Combating cybercrime as a special task in the area  of cybersecurity.- Cybercrime and cyberterrorism in Polish Law.- Cybercrime in selected European countries.- The entities and institutions in charge of combating cybercrime in Poland.- Operational activities in the field of cybersecurity.- Operational activities and the right to privacy.- Summary.- Biographies.- Bibliography.