Product requires login [SOLVED]

I have 1 product in my shop (added in 1.5.6.4) that requires the customer to login to purchase.
It still works after upgrade 2.0.1.1.

BUT, I can't find where I did this setting for the product. (login needed)
If I add a new product with identical settings it does not work. (NO login needed)
If I copy the old product It works (login needed)

Can some one please give me a hint where to set this up?

Please check the tables entries for both products. There might be some column in products table that store this setting.

Thank you

This is solved by @pprmkr

It was so easy ... caused by a download file to the product.
That requires register