Hi,
With HikaShop business there is an ACL (Access Level) system which will allow you to assign rights for users depending their category.
So, you can set an Access Level for "Registered" in order to show a category (and so all products into).
You can set ACL for specific products too.
Regards,
Jerome
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.