The documents and/or software distributed by this server have been
provided by the contributing authors as a means to ensure timely dissemination
of scholarly and technical work on a non-commercial basis. Copyright
and all rights therein are maintained by the authors or by other copyright
holders, notwithstanding that they have offered their works here electronically.
It is understood that all persons copying this information will adhere
to the terms and constraints invoked by each author's copyright. These
works may not be copied for commercial redistribution, republication,
dissemination or reposting without the explicit permission of the copyright
holder. For more information on any particular publication, please send
mail to the PDL Webmaster.
Permission to make digital or hard copies of part of ACM publications
for personal or classroom use is granted without fee provided that copies
are not made or distributed for profit or commercial advantage and that
copies bear this notice and the full citation on the first page or intial
screen of the document. Copyrights for components of this work owned
by others than ACM must be honored. Abstracting with credit is permitted.
To copy otherwise, to republish, to post on servers, or to redistribute
to lists, requires prior specific permission and/or a fee. Request permissions
from Publications Dept., ACM Inc., fax (212) 869-0481, or permissions@acm.org.
A major mission of the USENIX Association is to provide for the creation
and dissemination of new knowledge. In order to facilitate this process,
USENIX allows authors to retain ownership of the copyright to their
works, requesting only that it be granted an exclusive right to publish
for a limited period of time. The USENIX Association also wishes to
allow the free reproduction of published material for educational and/or
research purposes.
All technical, educational and professional publications of the Institute, except newsletters, but including Society and Technical Council Newsletters, are copyrighted by the IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.