Many SONY redbook CD releases were encoded in DSD. So it is not just reserved for SACD playback. The Stones CDs are a great example. The 2002 remastered redbook CDs were encoded using DSD. If you own any of the Stones SACDs, read the inside cover. It says both the SACD and CD layers benefit from DSD encoding. So, just because a Stones CD says "DSD" does NOT make it the SACD. In fact, it probably isn't.
"All men are frauds. The only difference between them is that some admit it. I myself deny it."