[jan-jaap]

If the shrinkwrap license posted above is legally enforceable, then there is no "right to use" simply because you own hardware. The license is nontransferable unless you signed a contract with the original purchaser to assume all of the responsibilities of the license (I don't think anyone ever did that). Note however that 1998 is the date of IRIX 6.5 and the license for 5.3 was almost certainly much different (jurisprudence around shrinkwrap licenses was highly uncertain through at least 1996).

At least in the EU the resale of software is legally allowed. Any clause in a license agreement that tries to restrict that is not enforceable in the EU.

Here's the license from the IRIX 5.2 Developer Update from 07/94. Sorry about the pattern in the background. It's not a shadow, it's SGI's funky design.



The bigger problem here is not some a shrinkwrap license says about reverse engineering and decompiling, but what the law says. In both the US and the EU reverse engineering is prohibited except for a few narrowly defined exceptions. In the US, these exceptions have to be re-approved every couple of years, I believe.