I'm at OKW right now using the broadband service.
When I first logged on, there was a standard acceptance page indicating the usual $9.95 charge with a note that it would be waived for DVC Members.
Later, another page came up requiring me to enter the last 10 digits from my room key in order to continue - again with the waiver for DVC members.
"
PAYMENT DETAILS: Clicking below will provide you with 24 Contiguous Hours of access to the Internet starting with the minute the connection is made. The access fee of $9.95 will be charged to Room kwid-XXXX-XXXX-01. The access fee is non-refundable and will appear as a charge on your folio. This charge does not apply to Disney Vacation Club Members."
Since the room ID is tied to a specific name, they may be able to verify that it is actually a DVC Member - regardless whether it states "DVC Member" on the key (that notation is actually just an indictation that the room was reserved thru MS).
We may not know the real answer until a guest/renter tries the system and is willing to accept the $9.95 charge if the free service truly is limited to only DVC Members. The notice is pretty clear that it is for DVC Members with no mention of "and guests" as with some perks, but the real answer will still depend on specifically how the system is set up for the acceptance page.
Stay Tuned!