While not the Real Book, the iReal Pro app allows you to download the "Real Book Song List" as a play-along chart. It is legal and costs $15. It does not include melodies (only chords), so you still need the book for the head.
You can purchase a legal, watermarked PDF directly from Hal Leonard or Sheet Music Direct. This is the closest you can get to a legally. It costs roughly $25–$30. It is searchable, printable (for your personal use), and you can store it on a tablet. the bb real book sixth edition pdf
The search for stems from a pivotal moment in music publishing history. By the early 2000s, Sher Music Co. stepped in to do what had previously seemed impossible: they created a legal, corrected version of the Real Book. While not the Real Book, the iReal Pro