yes, starting with last month Skipper viewer license terms slightly changed.
Skipper viewer is still for free for any amount of computers but only for users with active license maintenance.
This means that you can have one full license and still can activate viewer for as many computers (your colleagues, customers, etc.) as you need, but the maintenance has to be valid.
There is no reason to use skipper without full license because Skipper viewer serves only for "viewing" models created in full version.