In a DSM, the rights and obligations arising between e-commerce traders and their customers should be governed by a common set of rules and principles. EU law provides protection for EU consumers, irrespective of how goods are purchased. Harmonized EU legislation ensures safety of the goods being placed on the market. Moreover, the Consumer Rights Directive (2011/83/EC) has fully harmonised certain aspects of consumer and contract law applicable to online sales to consumers, such as pre-contractual information the customer should receive and the right of withdrawal from the contract. However, in other areas there are only minimum EU rules, which Member States may supplement with stricter requirements. For example, the Consumer Sales Directive (1999/44/EC) has set a minimum level of harmonisation for the remedies available when tangible goods are not in conformity with the contract of sale. Member States can also go beyond the requirements of the Unfair Contract Terms Directive (93/13/EEC), which provides protection against unfair clauses which have not been individually negotiated in B2C contracts relating to both tangible goods and digital content products.