In Veritas Volume Manager, the DMP feature can replace SecurePath. The exact support matrix is somewhere at support.veritas.com.
In the Windows case, the supported levels of firmware and drivers are different from the ones HP say is supported. Expect finger-pointing if something goes wrong.
An HSG80 pair as such doesn't require SecurePath, only if it's configured in multibus mode. Even so, you can configure hosts only to use one path thus eliminating the need for SecurePath. Of course, if the path goes down you're toast.
/charles