ETA: jjdebenedictus said it better and more concisely, but I'll leave this here anyway.
Publishing is changing, so I don't think anything is totally clear anymore
. However, in the past few years a lot of the vanity publishers have re-branded themselves as "providing self-publishing services". They still do the same things, they just talk about it differently. So it can be hard to separate the genuinely helpful from the snake oil sales
.
In general, if you are paying them instead of them paying you, you are likely to be in vanity publisher territory. But there is a chance you might be in self-publishing services territory.
I can only tell you what I go by:
--If they deliver you a completely set-up book ready to go to POD/e-commerce with your name or company on it as publisher, and there are no additional monies due them per book sold, I would say they had provided self-publishing services.
-- If they deliver you a cover, or typesetting, or editing, or other set-up services for an agreed fee, I would say they had provided self-publishing services.
-- If their company name shows up as publisher, or the ISBN tracks back to them as publisher, or they take the incoming money stream and pay you royalties, I'd say they are a publisher. If they took money from you to produce, set up, or market a book that they pay you royalties on, I'd say they are a vanity publisher. If they sell copies of your book to you so you can sell it, I'd say they are a vanity publisher.
Another way of looking at it:
Self-publishing: you are in charge of quality control, have your name as publisher, own the ISBN, and receive all income streams from the sale of the book. You may have paid subcontractors for art, typesetting, editing, etc. but the final product and rights belong to you.
Self-publishing with help: You may have contracted with a service to provide quality control, art, typesetting, editing, etc. but the final product and rights belong to you. You own the ISBN and receive all income streams from the sale of the book.
Vanity Publishing: you submitted your book to a publisher, who then charged you for some or all costs of production. That publisher's name is on the book, you have a contract with them that gives them publication rights, and the ISBN belongs to them. Income from sales of the book comes to them and they pay you royalties, or they allow you to buy copies of the book from them to sell. Either way, they get a portion of the ongoing income stream.
Please note, that just because a company offers self-publishing services instead of vanity publishing doesn't mean they are automatically less predatory. There are reasonably priced self-publishing services that offer good quality for the money, and there are companies that offer substandard services for extravagant and ridiculous prices. It's important to research how much it should cost to self-publish before contracting for services. It's also important to check the quality of what they provide. Some are great, some are incompetent, and some are horribly predatory.