I researched and found a few suggestions:
Steps for Mac OS X
1. Refresh the page, and then try watching the video again.
2. If the video still doesn't play, restart your computer, and then try watching the video again.
3. If the video still doesn't play, delete the video license file:
Tip: You may want to copy, print, or bookmark these steps, as they involve navigating away from this Help page
5. Uninstall and reinstall Silverlight:
If you still need help after trying these steps, Contact Us.
The top item is from Amazon and your issue. The bottom item is from Microsoft.
FOund this also. A little different fix.
I'm getting a 6000 series error when I try to watch movies.
← Watching Movies
We're sorry to hear you're having trouble viewing content with us. We have identified a fix for the specific error message you're having and have listed the steps below as the solution.
FOR PCs -
-Reboot your computer
-Delete the mspr.hds file
-Quit all open browsers - including this window! You may want to print the following steps.
-Press and hold the Windows key and tap the letter R on the keyboard at the same time.
-Type %allusersprofile% then select OK.
-Open the Application Data Folder.
-If the Application Data folder is missing, you need to show hidden files and folders:
Note: If you enable Show Hidden Files and Folders, be sure to change back to Do Not Show Hidden Files and Folders when you are done troubleshooting.
-Click on Tools.
-Click on Folder Options.
-Click on the View tab.
-Select Show Hidden Files and Folders.
-Open the Microsoft folder.
-Open the PlayReady folder.
-If the PlayReady folder is missing, you either do not have administrative privileges or your Silverlight installation has become corrupt and needs to be reinstalled.
-To continue, log in as an administrator on your computer, or take your computer to your system administrator for more help.
-If you are logged in as an administrator, use the Microsoft Fix it Tool linked at the top of this article, or see the How to clean a corrupted Silverlight installation and then reinstall Silverlight article on the Microsoft Support website.
-Right-Click the mspr.hds file and click Delete.
-If unable to delete the mspr.hds file, skip step 8.
-Open a web browser and try to play the title again.
-Type %programdata% then select OK.
-Right-Click on mspr.hds and click Delete.
-If unable to delete the mspr.hds file, skip step 7.
-Open a web browser and play your movie or TV show again.
FOR MAC -
Click the Finder icon from the Dock at the bottom of the screen.
In the menu bar at the top of the screen, select Go then Computer.
Click the Macintosh HD icon.
Open the Library folder.
Open the Application Support folder.
Open the Microsoft folder.
Drag the PlayReady folder to the trash.
If the PlayReady folder is missing, you may need to verify you have Administrative privileges on your Mac.
Empty the Trash
Open a web browser and try to play the title again.
Next, please follow the steps below to verify your OSX administrative rights:
To confirm your account rights:
From the Apple symbol Apple icon in the upper left corner of the screen.
Select System Preferences.
From the System section:
In Lion (10.7) or newer, select Users & Groups.
In Snow Leopard (10.6) or earlier, select Account.
Make sure "Admin" appears under the Current User.
Apple OSX Profile image showing User name and privileges
If you are logged in as Admin and are still unable to see or delete the PlayReady folder, there may be an issue with the permissions on your account. You may want to retry the previous steps while logged in as a different user with administrative rights, or create a new Administrator account and try again.
To create a new Administrator account:
Click the Lock Icon.
Enter your password.
Click Add (+) below the list of accounts.
Select Administrator from the New Account pop-up menu.
Enter a name that you would like to use for the account.
Enter the account password ***** the Password ***** Verify fields, and a hint to help recover the password.
Click Create User.
Ensure that the option to “Allow user to administer this computer” is checked.
Restart your browser
Have you had a chance to try this?
Is this still an issue?