This query could be referring to a few different things, and I want to make sure I provide the right kind of information.pkg vs .iso).
: Converting high-bitrate video and audio into more efficient formats (e.g., from uncompressed WAV to highly compressed AAC) to save space. Aggressive Algorithms ps4 iso games highly compressed repack
True "repacking" for PS4 games is possible but involves more than just standard file zipping. PKG Reaper & Tools This query could be referring to a few
: Repackers often remove "non-essential" content like secondary languages or low-resolution cinematics to further cut down the size. The Trade-off Keyloggers to steal PSN account details