| Ace Secret Disk | Unprotect PDF Files | Unprotect PDF from Owner Password | SysInfoTools PDF Protect and Unprotect | |
| 8.15.0.0 | 3.9 | 3.5 | 2.0 | |
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| Trialware | Shareware | Shareware | Shareware | Licence |
| FREE | $19.00 | $19.00 | $39.00 | Price |
| 13.50 MB | 1.51 MB | 2.36 MB | 7.11 MB | File size |
| May 1, 2025 | May 22, 2012 | Mar 12, 2014 | Jul 13, 2010 | Update |
| 435 | 44 | 39 | 31 | Downloads |
| Windows 11, Windows 10 32/64 bit, Windows 8 32/64 bit, Windows 7 32/64 bit | Win2000, Windows 7 x32, Windows 7 x64, Windows Vista, Windows Vista x64, Windows XP | Win2000, Windows 7 x32, Windows 7 x64, Windows Vista, Windows Vista x64, Windows XP | Windows XP, Windows Vista, Windows 7 x32, Win2000, Win98 | OS |
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