| US 7,594,258 B2 | ||
| Access control systems and methods using visibility tokens with automatic propagation | ||
| Jianchang Mao, San Jose, Calif. (US); Zhichen Xu, San Jose, Calif. (US); Chad Walters, San Francisco, Calif. (US); John Wang, San Jose, Calif. (US); and Albert Meltzer, Menlo Park, Calif. (US) | ||
| Assigned to Yahoo! Inc., Sunnyvale, Calif. (US) | ||
| Filed on Jun. 27, 2005, as Appl. No. 11/169,178. | ||
| Prior Publication US 2006/0294192 A1, Dec. 28, 2006 | ||
| Int. Cl. H04L 29/06 (2006.01) | ||
| U.S. Cl. 726—9 [726/27] | 24 Claims |
| 1. A method for sharing content items among a plurality of users, the method comprising:
defining a first user token and a first content token, the first user token and the first content token each representing
a first visibility policy for determining which of the plurality of users are granted access to content items posted by a
first one of the plurality of users, wherein the first user token and the first content token are matching tokens;
associating the first user token with each user who is granted access to content items according to the first visibility policy;
receiving a visibility instruction for a first content item from the first user, the visibility instruction indicating that
the first content item should be shared according to the first visibility policy; and
in response to the visibility instruction, associating the first content token with the first content item in an index of
content items, wherein when one of the plurality of users requests access to the first content item, the request is granted
or denied based on whether the first content token matches a user token associated with the requesting user.
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