Sony SRS-ZR5 Help Manual page 176

Files with DRM (Digital Rights Management) copyright protection cannot be played on the speaker. To check if a WMA file is protected by DRM,
right-click the file on the PC. If there is a [License] tab, the file is DRM-copyrighted.
When you listen to music via a home network, it may take some time to start, since each DLNA-compatible device has to recognize the component
currently used.
Some content may not be playable with DLNA certified products.
Related Topic
Listening to music on a PC via a network (Media Go with SongPal operation)
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