You can access the eTwinning eSafety Rules from the link:

https://www.etwinning.net/en/pub/support/esafety-and-etwinning.htm

Teachers  will collect  parents'  permissions for children to participate in the project.Meet Europe and learn languages

The permissions should include:

the name of the project,

consent to the publication of the student's name and surname,

consent to the publication of photos and works of students.

Teachers keep the parents' permissions  in their schools.

Example in English 

I give my consent for my child ................ to participate in the international eTwinning project Meet Europe and learn languages .I consent to the publication of the child's name and surname, image in photos /videos and for the publication of works, photos and projects by my child.

Parent's signature / date