| Number | Date | Country | Kind |
|---|---|---|---|
| 7-184199 | Jul 1995 | JPX | |
| 8-006549 | Jan 1996 | JPX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4713753 | Boebert et al. | Dec 1987 | |
| 5173939 | Abadi et al. | Dec 1992 | |
| 5220604 | Gasser et al. | Jun 1993 | |
| 5321841 | East et al. | Jun 1994 | |
| 5335346 | Fabbio | Aug 1994 | |
| 5475819 | Miller et al. | Dec 1995 | |
| 5495412 | Thiesen | Feb 1996 | |
| 5511187 | Cragun | Apr 1996 | |
| 5539906 | Abraham et al. | Jul 1996 | |
| 5587935 | Brooks et al. | Dec 1996 | |
| 5675745 | Oku et al. | Oct 1997 | |
| 5689708 | Regnier et al. | Nov 1997 | |
| 5692141 | Kamisango et al. | Nov 1997 | |
| 5764890 | Glasser et al. | Jun 1998 |
| Entry |
|---|
| Webber, G. E., "Multiple levels are key to security in open environments", Communications News, vol. 29, No. 5, Abstract Only, May 1992. |
| Proc. Symp. User Interface Software and Technol. (UIST), Nov. 11, 1991, No. Symp. 4, Assoc. For Computing Mechinery, pp. 69-78, Dewan et al., "Primitives For Programming Multi-User Interfaces". |
| Sharing Perspectives, Oct. 31, 1992, Shen et al., pp. 51-58, "Access Control For Collaborative Environments". |