Read below for the actual license but the gist is that you can use the illustrations in any project, commercial or personal without attribution or any costs. Just don’t try to replicate creativestock, redistribute in packs the illustrations or create integrations for it.
If you are working on something and want to use illustrations to improve its appearance, modified or not, without the need for attribution or cost, you are good to go. If you find creativestock or its illustrations to be in the center of what you are doing (e.g. sell or re-distribute one/some of them, add them in an app), then you probably should not proceed.
All images, assets and vectors published on creativestock can be used for free. You can use them for noncommercial and commercial purposes. You do not need to ask permission from or provide credit to the creator or creativestock. More precisely, creativestock grants you an nonexclusive, worldwide copyright license to download, copy, modify, distribute, perform, and use the assets provided from creativestock for free, including for commercial purposes, without permission from or attributing the creator or creativestock. This license does not include the right to compile assets, vectors or images from creativestock to replicate a similar or competing service, in any form or distribute the assets in packs or otherwise. This extends to automated and non-automated ways to link, embed, scrape, search or download the assets included on the website without our consent.
Are registered trademarks of their respected owners. Are included on a promotional basis and do not represent an association with creativestock or its users. Do not indicate any kind of endorsement of the trademark holder towards creativestock, nor vice versa. Are provided with the sole purpose to represent the actual brand/service/company that has registered the trademark and must not be used otherwise.