Re-negotiating Vendor-Specific Keys

[Bart Crane <bcrane@iready.com>]

Title: Re-negotiating Vendor-Specific Keys

Sec. 4.2 says "... re-negotiation ... is forbidden for many keys." 

Sec. 4.3 says "If an attempt to re-negotiate/re-declare parameters not specifically allowed is detected ...".

If an implementation wishes to determine whether an unrecognized vendor-specific key which is being re-negotiated is a violation of the protocol, it would need to access to information regarding that key. 

If an implementation had such information regarding that unrecognized key, the key would not be unrecognized.

If an implementation does not recognize a vendor-specific key, it can not decide if re-negotiating that key is a protocol violation. 

Therefore, an implementation need not "remember" all unrecognized vendor-specific keys in order to detect protocol violations, because it does not have access to information necessary to determine if a protocol violation took place.