Q: This movie can be played only on displays that support HDCP (High-bandwidth Digital Content Protection).

For anyone who is still struggling with this issue, I just spent about 1 hour trouble shooting with AppleCare and here is the fix, at least for MacBook Air.

Good luck.

I have the same issue:  I have a fresh (clean) install of El Capitan on my Macbook pro and iTunes won't play on the laptop's screen, saying the built in display lacks HDCP.  There is no Display Link software on my computer.  When I followed the above link to it, it says that Display Link is special software to allow you to use your laptop with external monitors over a USB port.  I do not think I want to risk installing something like that to try to fix my native OS-X HDCP issues, as it seems like that would only be likely to cause more issues in the future, and I have no need to try to run a monitor over a USB port at this time.

In my case, the error is intermittent.  It comes and goes.  Despite all the comments I've seen on this thread about third party software, how can this not be an Apple issue?  Either Apple can bless its built in laptop screen with HDCP or it can't.  This is iTunes after all.  Note that I don't have the issue with Netflix, so it seems these are independent matters?

I'll further add that I've never had this issue until I upgraded to El Capitan, and I actually have the same, but less 3rd party programs installed in El Capitan than I did in Mavericks, because I didn't reinstall all my programs from before.

Well, I was unable to resolve the issue in all ways  mentioned in these posts.

I went to Amazon Video and bought the movie I wanted there.  Jeez; silly...

I notice this problem after downloading a TV series in HD. No problem, I just downloaded the SD version. Still the same error.

I went to the displaylink web site:  http://www.displaylink.com/downloads/osx

Clicked DisplayLink USB Graphics Software for Mac OS X

Accepted the Software License Agreement and it downloaded the dmg.

This installer also has and uninstaller. I ran the uninstaller, restarted and was able to view the SD and HD on my MacPro cinema displays.

I still can't get this to work. I'm running three displays on a new Mac Pro. I have about 5 of the 20 movies I have that I can watch. Paid for them all and at one point they all worked before some idiotic update. I'd really just like my money back on all of the movies I'm unable to watch now.

I was hoping my success might help others, nuts.

After uninstalling displaylink from the software installer from the link below, I guess you could install the latest version of displaylink to see if that works.

Does the SD version of the movie work?

Hope you can get this worked out.

Jim

Displaylink web site:  http://www.displaylink.com/downloads/osx

I only ever download the HD versions. I don't see that it came with an SD version. I heard that the movies from Amazon downloads will work. I guess I'll just start giving them my money instead. I'll try a previous version and see what I get.

Update: Tried the previous version and no luck.

Had the same problem and with no external monitor or any of the apps listed in this thread.  I read thru this whole thread without any help and little hope.

I finally read this page: http://www.xlr8yourmac.com/archives/aug14/080814.html and then I went looking for any screen capture software I might have forgotten about.  I actually did have one installed.  It was called 'Power Screen Capture' and it appeared to be running in the background with out being in my startup list.  That made it so I could not trash it from my applications folder.  Finally realized that there was an icon of it at the top of my screen so I clicked it open.  Happily there was a power button on the top right.  I shut it off, tossed the app, restarted and all my problems went away.  Hope this helps someone else who was as ****** at Apple as I was.