They say that if something seems too good to be true then it probably is. It's starting to look like that's the case with the software development kit Apple will unveil for the iPhone and iPod touch on March 6.

Rumors are floating around that the company is putting some serious limitations on what developers can actually do with the software. iLounge cites several sources familiar with the SDK who spilled the details on the condition of anonymity.

The limitations reportedly include that all third-party apps must use the iTunes store for distribution, which is something that we've heard before, and that the developers won't be able to have their apps directly interface with "Dock Connector-based accessories connected to the iPhone or iPod touch - a decision that we are told could cripple development of new accessories," iLounge reports.

The most restrictive of the rumored limitations iLounge reported on is that Apple will have final say over which SDK-based applications can be published for its devices and make only those approved apps available.