...

• your are allowed to publish a preprint (submitted version)
• you are allowed to publish a postprint (accepted version) in an open acccess repository after an embargo of 12 months or on your homepage without embargo
• your are not only allowed to publish the publisher's version

...

• if you have paid an open access fee to the publisher

Image Added

Securing authors' rights

Ideally, you should always make sure whether and to which extent self-archiving in an institutional repository is permitted before signing a publishing contract.

...