Glad to be helpful.

From the juridical point of view, citing the gpl in your license is terrible (you didn’t specify the version either). The best thing is to actually write everything from the gpl that you want.

Thank you for your response, I didn’t know about secure erase. Looks like my knowledge is a bit outdated.

I have never read much about trim before. Now I’m curious about something: if an ssd was trimmed, is all deleted data lost? Is filling an ssd with random data unnecessary if we want so safely delete something?