This signifies that the CD was ripped using the industry-standard software for bit-perfect extraction. It ensures no "jitter" or read errors were introduced during the process.
A high-quality archive should include an EAC log file. Check these parameters to ensure a perfect rip: Extraction Mode: Secure (This ensures EAC re-reads any errors). AccurateRip: Pink Floyd - Meddle -1971- 1988 -EAC - FLAC--oa...
For those hunting for the "ultimate" digital copy, the shorthand in the title reveals its quality: This signifies that the CD was ripped using