If your item was previously published, e.g. a journal article, you may have signed over copyright to your publisher. Prior to depositing a copy to IRR, you need to determine whether your publisher permits self-archiving and which version of the paper you can deposit. You can use Sherpa Romeo to check this.
Sherpa Romeo is an online resource that aggregates and analyses publisher open access policies from around the world and provides summaries of publisher copyright and open access archiving policies on a journal-by-journal basis. And you can access this tool through IRR.
Using Sherpa Romeo in 6 Steps