There are several firms that market themselves as "aided self-publishing companies." They use a similar business strategy to the one outlined above for vanity publishers (i.e., you pay for all the production and marketing services). However, instead of publishing actual books, they create and sell digital products such as eBooks or apps. These companies provide writing workshops or other resources for authors looking to publish their work without investing too much time or money in it. They also provide editing, design, and marketing services for an up-front fee. Since these are digital products, they can be sold anywhere digital goods are sold. Like with vanity publishers, beware of companies that claim to offer "free services" in exchange for your copyright. Some will ask you to sign away all rights to your work. If this happens, find another company. The main difference between aided self-publishing companies and vanity publishers is that the former don't produce new content. Instead, they provide services that allow existing content to be resold. In addition, they usually have more flexible terms and conditions than vanity publishers because you aren't binding yourself to a specific book project. You can always change your mind later if you decide to pursue publication elsewhere.