Can I use Lulu in conjunction with another publishing company?
Lulu doesn't restrict the marketing of your work, but other companies may do so. Make sure you understand the terms and conditions of all the businesses you deal with. We urge authors to take advantage of all the sales venues available to them and to share their successes with us and with other authors.
If you have a Lulu ISBN or purchased Published by Lulu distribution, you may not use your ISBN with another publisher.