- Judgment in favor of SEA in SEA v. PKWARE and Phil Katz
- Technical specifications of the PKZIP file formats from info-ZIP
- Current file format specification from PKWARE (including many recent features that are not widely supported)
- 18 Years of ZIP format: Happy Birthday at The Data Compression News Blog
- Comparison of the performances of various methods of data compression (french)
- .NET Zip library - reads and writes zip archives.
- ZIP2 file format specification