Valid Quicktime 7 Pro Key no longer works

Apple only keeps a copy of your purchase for 18 months. After that it's the owners responsibility.

Since June of 2009 QuickTime Player 7 has been moved to the Utilities folder and is not a part of a standard OS X install. You have to download it from Apple and enter your registration.

The registration number is keyed to the name you used in the original purchase and both name and number must exactly match that found in the email.

To avoid entry errors use copy paste for both fields. Even a missing Mr. in the name will cause it to show as invalid.

My question is really how do I get Apple to properly address this issue and give me a new license key.

Since you have already confirmed that Apple provided a valid registration code which you used for 10 years without problem, it is unlikely that Apple will provide a second registration code for what appears to be a migration workflow problem. In addition, without further information regarding the specific nature of your problem, it is unclear if you are trying to register the QT X player for "Pro" use, attempting to enter the registration information via the discontinued System Preferences window tab, using the Return key when you should be using the Tab key, failing to open a valid media file before trying to access a "Pro" feature, etc.

It is my assertion that Apple is not recognizing the name and key because it has been ten years and Apple Support is of no help in resolving the issue.

Apple has nothing to do with this. The registration process to unlock QT 7 "Pro" features is self-contained within the QT 7 Player app on the local system. Either the data you are trying to enter is incorrect, it is being entered incorrectly, the QT 7 Player app is corrupted, and/or the migrated registration file is corrupted. Most people simply install the free QT 7 Player compatible with their new/current Mac OS X system and then upgrade it for "Pro" use.

Entering the key manually and cut and pasting have made no difference.

Again, you are not telling us what "Quicktime 7 Pro no longer is the Pro version and I cannot register the license" actually means. Did you, for instance, uninstall the the QT 7 app and related files before installing a system compatible version and entering the registration data manually.

My MPEG2 encoder was not extended even though I had a valid license key and web order number. It appears Apple just drops license keys that are over ten years old (or so it appears) and no longer keeps those purchase records.

I don't believe the MPEG2 encoder was ever sold as an independent codec but was included with older "Pro" video editing/DVD authoring apps prior to the release of Compressor. My version became obsolete following one of the major system upgrades and I simply switched to Compressor and Toast for most MPEG2 targeted conversion workflows. While the MPEG2 video decoder is still sold as an independent codec for QT 7 use, its support is now built into the QT X support embeds built into current QT X operating systems. The QT 7 version was updated in 2006 (pre-QT v6.4 and QT v6.4/Intel Mac versions) and 2009 (current QT 7 version) if I remember correctly. So there is also the question of which version you may be trying to use if applicable.

In any event, providing more details might assist QTKirk in solving your current problems.