(b) The freedom to access and use postal services, where postal items meet the specifications required by the provisions of this Law. Restrictions on access and use of postal services are only permitted for the following reasons: (i) security of the operation of the postal network, employed persons of postal service and users, and (ii) protection of the confidentiality of correspondence (c) The principles of equal treatment and non-discrimination of users, access to the postal network under transparent, proportionality and non discrimination, as well as the protection of healthy competition. (d) Ensuring the principles of confidentiality of correspondence, the confidentiality of postal communication, personal data protection, the respect of privacy and the safeguarding of copyright. The staff of postal service providers is subject to the obligations of this subsection. (e) Environmental protection and regional planning. (f) Compliance with the terms and conditions of employment and social security regimes, as defined by law and / or collective agreements as a result of negotiations by the social partners in accordance with European Union law and the Law. (g) Promoting the interests of users, which are ensured particularly: (i) By developing activity in the postal service sector providing users the right to universal service, as this service is determined in this Law; 21