1*c9e00483SDavid du ColombierThis is a re-release of the final version of the 4th Edition of Plan 9 2*c9e00483SDavid du Colombierfrom Bell Labs distributed directly by Bell Labs. 37dd7cddfSDavid du Colombier 49a747e4fSDavid du Colombier4th Edition was originally released by Lucent Technologies in 2002. It 59a747e4fSDavid du Colombierwas released under the terms the Lucent Public License Version 1.02. 69a747e4fSDavid du Colombier4th Edition continues the development of the same ideas, but in many 79a747e4fSDavid du Colombierways represents the base of what most people think of as "modern" Plan 89a747e4fSDavid du Colombier9 today. The ubiquitous file protocol, 9P, got its first revision, to 99a747e4fSDavid du Colombier9P2000, which caused changes to many parts of the system. It also saw 109a747e4fSDavid du Colombierthe debut of venti(8) and fossil(4), which began replacing the 119a747e4fSDavid du Colombiervenerable old file server, fs(4). Authentication largely moved to a 129a747e4fSDavid du Colombierseparate agent, factotum(4). Updates moved to replica, and the wiki 139a747e4fSDavid du Colombierwas created. The original release notes for this edition can be found 149a747e4fSDavid du Colombierat /sys/doc/release4.ms. 157dd7cddfSDavid du Colombier 169a747e4fSDavid du ColombierWhile this release is a recognizable ancestor of the latest Plan 9 179a747e4fSDavid du Colombieravailable, it is still quite old, and this release is mostly for 189a747e4fSDavid du Colombiereducational and research purposes. The file protocol and 199a747e4fSDavid du Colombierauthentication mechanisms are continued in modern Plan 9, though, so 209a747e4fSDavid du Colombierresearchers looking to run this should have an easier time than with 21*c9e00483SDavid du Colombierall previous releases. This is a second release of the 4th Edition, 22*c9e00483SDavid du Colombiermarking the final state of Plan 9 as distributed directly by Bell 23*c9e00483SDavid du ColombierLabs. 247dd7cddfSDavid du Colombier 259a747e4fSDavid du ColombierThe only changes between this release and the original 4th Edition 267dd7cddfSDavid du Colombierrelease are the new NOTICE, LICENSE, and README files, and moving the 277dd7cddfSDavid du Colombierold ones. In particular, any copyright notices attributing things to 287dd7cddfSDavid du ColombierLucent Technologies or Bell Labs, or notices on restrictions of their 297dd7cddfSDavid du Colombieruse, should be read as historical; all such rights have been 307dd7cddfSDavid du Colombiertransferred to the Plan 9 Foundation and released as open source. 317dd7cddfSDavid du ColombierParts (notably, the fonts) maintain trademark and copyright to their 327dd7cddfSDavid du Colombierrespective parties (such as Bigelow & Holmes Inc.) and were included 337dd7cddfSDavid du Colombierin Plan 9 by permission; those copyrights are unaffected by the 347dd7cddfSDavid du Colombiertransfer to Plan 9 Foundation and remain in effect per the terms found 357dd7cddfSDavid du Colombierin this distribution. 36