Earlier quoted context omitted.
many works are distributed under dual licensing and how you obtained the files define it's license. now what I don't know is the legality of attaching a license to a redistribution of a public domain work - technically one can claim recompression is transformative and that you hold a license to the altered work, in which case the origin of the file matters in defining if third parties are infringing (and this is why…
What does IAMNYL mean? I googled it but I didn't come up with anything
More common is IANAL, which means "I Am Not A Lawyer".