Ultima V: Lazarus is a fan project created by Team Lazarus, and more information can be found at their Official Site.
More information, including help, hints, mods, and more can be found at the U5:L Forums.

Legalities

Ultima V: Lazarus was produced completely nonprofit by a group of avid Ultima fans who call themselves "Team Lazarus." Lazarus is available for users who own a copy of Gas-Powered Games' Dungeon Siege**, the engine they modded. Dungeon Siege is required because Lazarus is a Siegelet for it and we do not own the rights to the Dungeon Siege engine.

Although we have not been prohibited from creating this project, we have thus far been unable to acquire written permission for Lazarus due to the continually changing senior staff at OSI. We are proceeding with our efforts in good faith that--because of the non-profit and non-damaging nature of our project (in addition to our positive intentions toward Origin, EA, and Ultima in general)--EA will refrain from shutting us down. The sole purpose of our project has been to gain a working knowledge of game development through experience, not to turn a profit.

** Dungeon Siege is developed by Gas-Powered Games (GPG).

Ultima® & Lord British® are Registered Trademarks of Origin Systems, Inc. & Richard Garriott.

Ultima V: Warriors of Destiny © 1987, 1988, 1989, 1990 Origin Systems, Inc. All rights reserved.

Dungeon Siege © 2002 Gas-Powered Games. All Rights Reserved.

Ultima V: Lazarus is a fan-built recreation for Ultima V and is not affiliated in any way with Origin Systems, Inc. or Gas-Powered Games.

ULTIMA V: LAZARUS IS A FAN-BUILT MOD FOR THE DUNGEON SIEGE^TM GAME.
DUNGEON SIEGE^TM WAS DEVELOPED BY GAS POWERED GAMES© AND PUBLISHED BY MICROSOFT^TM
ULTIMA© AND ULTIMA V: WARRIORS OF DESTINY^TM WAS DEVELOPED BY ORIGIN SYSTEMS^TM, 1988 A DIVISION OF EA^TM