1. The accessibility requirements referred to in Article 3 apply to the extent that they do not introduce a significant change in an aspect or feature of a product or service that results in the alteration of the basic nature of the product or service.
2. Accessibility requirements referred to in Article 3 apply to the extent that they do not impose a disproportionate burden on the economic operators concerned.
the estimated costs and benefits for the economic operators in relation to the estimated benefit for persons with disabilities, taking into account the frequency and duration of use of the specific product or service.
4. The burden shall not be deemed disproportionate where it is compensated by funding from other sources than the economic operator’s own resources, whether public or private.
5. The assessment of whether compliance with accessibility requirements regarding products or services imposes a fundamental alteration or disproportionate burden shall be performed by the economic operator.
6. Where the economic operators have used the exception provided for in paragraphs 1 to 5 for a specific product or service they shall notify the market surveillance authority of the Member State in the market of which the product or service is placed or made available. Notification shall include the assessment referred to in paragraph 3. Microenterprises are exempted from this notification requirement but must be able to supply the relevant documentation upon request from a relevant market surveillance authority.