CS5 is no longer sold, so you will need to look at buying CS6
But, as Hunt said, this is not Adobe sales, this is a user help forum... Click the big red A at the top left to go to Adobe sales
I tried to contact Adobe but no email or report session is open.
plug in rights means that through in-house developed MAN system , to be able to open Adobe editing SW and use it.
in other words, if we could buy API to be able to talk to Adobe editing SW resources?
You might want to check out the SDK forum: