As a legal matter, Zuma and his lawyers are of course perfectly within their rights to oppose the request because if admitted the documents could help convict Zuma and send him to jail for 15 years.
As a political matter though, I am surprised that no one is asking why Mr Zuma would want to oppose an application for a release of the documents. If he is innocent as he professes, he surely would be glad for all the relevant documents to be placed before a court because it could only prove his innocence.
By opposing this application he places himself in a politically awakward position, because it suggests that there is something to hide.
Unfortunately Mr Zuma and his supporters have so bamboozled commentators and the general public with their bleetings about being innocent until proven guilty, that few people are prepared to make a political or ethical judgment against Mr Zuma before he is actually convicted of a crime.
Plain common sense tells me that Mr Zuma might still be innocent, but that he is decidedly not untainted by the criminal investigation and his response to it.