Update README.md

README.md

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 # osmd-extended
 Extended OSMD, usually exclusive to OSMD Sponsors, with audio player, transposition, etc.
 
+Please do not share this code publicly.
+
 The code and build process works pretty much the same as OSMD,
 so take a look at the [OSMD Readme (and Wiki)](https://github.com/opensheetmusicdisplay/opensheetmusicdisplay/blob/develop/README.md) for technical info.