I've got the same problem using a trial version.
When trying to start the preview it comes the message: can't support playing protected m4v files
When trying to start the conversion of the film it comes a windows with the notice of only 1 minute conversion, but in the output path nothing appears.
In iTunes the film is shown without problems.
See attached files:
Thanks a lot for any answer
Hello, thank you for your interest in Aimersoft DRM Media Converter.
As for your case, there are some explanations:
1. iTunes protected M4V cannot be previewed on the viewing window. But other files like protected WMV and unprotected video files can be previewed.
2. Generally speaking, Aimersoft DRM Media Converter can convert iTunes M4V videos if the files can play well in iTunes. But there are a few cases when the software fails to do that because of small bugs. Please try again and see whether it works. If it still doesn't work, there may be some other problems like the sound virtual card is not installed successfully.
The registered version will allow you to get the full video, you can either click "Help" > "Purchase" from the software or go to http://www.aimersoft.com/purchase/buy-almedia-converter.html to buy the software.
If you have any other problem, please feel free to contact us. We will always quickly respond to help your solve the problems.