Playback and Recording : Record Setup : Record Enabling Tracks : Record Safe Mode

Record Safe Mode
Pro Tools provides a Record Safe mode on a per track basis that prevents tracks from being record-enabled by accident. Use Record Safe mode to protect important audio or MIDI data on a track from being recorded over.
To put an audio, MIDI, or Instrument track in Record Safe mode:
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Command-click (Mac) or Control-click (Windows) the track’s Record Enable button. The Record Enable button is grayed out.
Command-click (Mac) or Control-click (Windows) again to take the track out of Record Safe mode.
To put all audio, MIDI, and Instrument tracks in Record Safe mode:
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Command-Option-click (Mac) or Control-Alt-click (Windows) the Record Enable button on any track.
Command-Option-click (Mac) or Control-Alt-click (Windows) again to take all tracks out of Record Safe mode.
To put all currently selected tracks into Record Safe mode:
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Command-Option-Shift-click (Mac) or Control-Alt-Shift-click (Windows) the Record Enable button on any of the selected tracks to toggle them in and out of Record Safe mode.