PbD is not without challenges. For example, adopting new technologies and tools, such as encryption, anonymization, pseudonymization, data minimization and privacy-enhancing technologies (PETs), can protect the privacy and security of personal data. However, these technologies and tools can also introduce technical complexity, interoperability issues and performance trade-offs that can affect the functionality and usability of e-business systems, products and services. Additionally, PbD can require e-businesses to change their organizational culture, policies and processes. This can involve establishing a privacy governance framework, appointing a privacy officer or a data protection officer, conducting privacy impact assessments, implementing privacy audits and reviews, and providing privacy training and awareness to their staff. However, these changes can also encounter resistance from the management, staff and stakeholders of e-businesses. Furthermore, PbD can require e-businesses to anticipate and respond to the changing expectations and preferences of their customers and regulators regarding privacy and data protection. These expectations can vary across different regions, sectors and contexts, creating uncertainty for e-businesses who may have to balance the trade-offs between privacy and other values such as convenience, personalization or profitability.