I checked the Workbench pdf and didn't see any copyright statements. Were the original guides placed in public domain or something?
*EDIT* Ah the installation manual:
COPYRIGHT
Copyright © 2000 by Amiga Inc., USA. All rights Reserved. This document may not in whole or in part, be copied, photocopied, reproduced, translated or reduced to any electronic medium or machine readable form without prior consent, in writing, from Amiga Inc. If this product is being acquired for on behalf of the United States of America, its agencies and/or instrumentalities, it is provided with RESTRICTED RIGHTS, and all use, duplication, or disclosure with respect to the included software and documentation is subject to the restrictions set forth in subdivision (b)(3)(ii) of The Rights in Technical Data and Computer Software clause at 252.227-7013 of the DOD FAR. Unless otherwise indicated, the manufacturer/integrator is Amiga Inc., USA.
Granted Amiga Inc. isn't in favor these days but still, I'd say that copyright should be respected.
