Nothing is 100% safe, at some point it has to be decoded/decrypted and displayed.
If it is viewable you can assume it is possible to copy it in some way (even resorting to screen scraping/recording).
Streaming encrypted content from a server to a secure client application will stop the average joe but it won't stop a dedicated tech savvy geeks.
For examples see how quickly DVD, Bluerary and HDCP (used for HDMI) encryption have been cracked in the past when they have gotten in the way of geeks fair (or otherwise) use of media/content.
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