I would like to know something about a tensor product of categories and it seems Deligne tensor product is what I am looking for. But the paper "Categories tannakiennes" by Deligne is not available for me. (Even if it is, I am not that familiar with reading in French.)
Is there any good introductory reference for Deligne tensor product in English?
Thank you in advance.
Perhaps you could start with these notes from the larger set at MIT OpenCourseWare.