Depositing your work in a repository does not infringe on publisher rights.
Although some authors worry that depositing their work in a repository will not be allowed by publishers, most journals already allow for some form of OA deposition or archiving of final (postprint) articles. 62% of journals allow for immediate OA self-archiving (Harnad, 2007) and many more may allow for preprint or delayed postprint deposit. Additional analysis demonstrates that it is likely that publishers and open access can co-exist without one destroying the other, with self-archived copies or articles existing as supplements to the published version.
Berners-Lee, T., De Roure, D., Harnad, S. and Shadbolt, N. (2005). Journal publishing and author self-archiving: Peaceful Co-Existence and Fruitful Collaboration. (unpublished) http://eprints.ecs.soton.ac.uk/11160/
Harnard, S.(2007, 28 April). Green OA Self-Archiving Needs a Lobbying Organisation. Open Access Archivangelism http://eprints.ecs.soton.ac.uk/13966/1/arch-lobby.html
Harnad, S. and Brody, T. (2004). Comparing the impact of Open Access (OA) vs. Non-OA articles in the same journals, D-Lib Magazine, 10(6). http://www.dlib.org/dlib/june04/harnad/06harnad.html
SHERPA. (2006-2008). RoMEO: Publisher copyright policies & self-archiving.