I wonder what are the possible data formats that can be published for 1-star level of open data.
The only example I have found is with the PDF format, I wonder if there are other possible formats to obtain the first star.
For level 1, any format is fine. Even a picture of data written on a sheet of paper is OK. That's because level 1 is only about web availability and license.
So, yes, any format: PDF, XLS, CSV, JPG, SQL, or even opaque binary blobs.
(1 star) Available on the web (whatever format) but with an open licence, to be Open Data