Bullshit. The cause of no EDC data on early PS1 discs was a mastering error. PS1 discs on the ToC area have got a wobble groove with encoded licence information (mythical SCEA/E/I letters). As the CD-R media has already got the wobble on the whole surface of the disc (to keep synchronization during the burning), there is no way to write this licence string at home. Sony, as the one of the inventors of the CD, knew what they were doing. PS2 CD discs have got a similar one, but with an extra layer of protection consisting Disc ID key to decrypt the logo.