Stakeholders have expressed some uncertainty about how to comply with EC 29/2009, the Data Link Services Implementing Rule.
In partnership with the European Commission and EASA the EUROCONTROL LINK Programme has been working to address those concerns. A stakeholder workshop was held in March 2010 to address the issues and a brochure is now available on the LINK website explaining how Certificates issued by EASA will be accepted as an EC Declaration of Conformity or an EC Declaration of Verification. It also lists and answers frequently asked questions.
You can find the brochure here.