Cartophilie.be wants to protect the owner of the copyright. In deltiology this is very difficult to check what is protected or not. If you believe a postcard view on cartophilie.be is copyrighted, please tell us we will remove the scan and verify the copyright. Thank you for your help
If an artist is totally unknown on the net or in the dictionary of illustrator it will be normally free of right. In this case one can prove one's good faith.
If an artist died more than 70 years ago then his works are free of rights