| Passper for PDF | Ace Secret Disk | PDF Encrypt Tool | PDF Page Lock | |
| 4.0.0 | 8.12 | 3.50 | 2.0.4 | |
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| Demo | Shareware | Shareware | Freeware | Licence |
| $19.99 | $29.95 | $29.95 | FREE | Price |
| 2.80 MB | 6.65 MB | 3.05 MB | 11.33 MB | File size |
| Jul 15, 2024 | Feb 26, 2024 | Feb 25, 2014 | Jun 28, 2018 | Update |
| 3 | 70 | 39 | 34 | Downloads |
| Windows 11, Windows 10 32/64 bit, Windows 8 32/64 bit, Windows 7 32/64 bit, Windows Vista, Windows XP 32/64 bit | Win11, Win10, Windows 7 x32, Windows 7 x64, Windows 8 | Windows 2000, Windows XP, Windows 2003 | Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP, Other | OS |
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