The General Data Protection Regulation's (GDPR) requirement for parental consent, as outlined in Article 8, applies specifically when processing a child's data for information society services is based on the legal basis of consent (Article 6(1)(a)). However, processing can be lawful under other legal bases. The provision of preventive or counselling services directly to a child is often carried out in the public interest or as part of a legal obligation related to child welfare and protection (Article 6(1)(e) or 6(1)(c)). In these situations, consent is not the legal basis for processing, and therefore the parental consent requirements of Article 8 do not apply, allowing these vital services to be provided confidentially.

A. Market research is a commercial activity; this interest would not override the fundamental rights and specific protections afforded to children under the GDPR.
C. While educational, if the materials are provided via an "information society service," parental consent would likely be required if consent is the chosen legal basis.
D. Legitimate interest is generally not an appropriate legal basis for processing children's data, as their rights and interests are given special weight and are likely to be overriding.

1. Regulation (EU) 2016/679 (General Data Protection Regulation), Article 8(1). This article specifies that the rules for parental consent apply "Where point (a) of Article 6(1) [consent] applies, in relation to the offer of information society services directly to a child". This clarifies that the rule is tied to consent as the legal basis.

2. Regulation (EU) 2016/679 (General Data Protection Regulation), Article 6(1)(c) and 6(1)(e). These articles provide alternative lawful bases for processing, such as compliance with a "legal obligation" or for the "performance of a task carried out in the public interest," which are often the bases for child protective services.

3. European Data Protection Board (EDPB), Guidelines 05/2020 on consent under Regulation 2016/679, version 1.1, adopted on 4 May 2020, paragraph 130. The guidelines state: "Article 8 only applies to information society services offered directly to a child. It does not apply to the processing of children’s personal data in other contexts, such as processing operations by public authorities for education or child protection purposes."

4. Regulation (EU) 2016/679 (General Data Protection Regulation), Recital 38. This recital emphasizes that "Children merit specific protection with regard to their personal data, as they may be less aware of the risks, consequences and safeguards concerned and their rights". This underpins why commercial interests (A, D) are unlikely to justify processing without robust safeguards like parental consent.