Francesco Poli wrote:
Can anyone more knowledgeable than me on these topics shed some light,
please?
The main question is: do I really need a copyright license to use,
modify and/or redistribute such a (published) database?
If the selection of the data that was put in the database involved
creative activity by its maker, then yes you need a copyright license.
If the database was created by a European company, then you need
a license under its database right. (No database rights for US publishers)