Thanks for the answers.
The majority of the our content is submitted by the authors that give us the permission to publish it (no money involved) so we are not entitled to act on behalf of the authors.
That is why I guess I canít file for a DMCA
Also as I said the scrapers take a page and generate around 50 to 100 different versions by just showing excerpts in each one, sadly ranking higher than us. So we would have to file about 50.000 DMCAs at least.
I was hoping that Google could look into this the same way they been doing it the last years: to determine who have published the content first and rank them likewise.