| PDF Page Lock | Ace Secret Disk | PDF Unshare | PenProtect | |
| 2.0.4 | 8.12 | 1.5.3 | 1.45 | |
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| Freeware | Shareware | Freeware | Demo | Licence |
| FREE | $29.95 | FREE | $19.00 | Price |
| 11.33 MB | 6.65 MB | 19.82 MB | 1.81 MB | File size |
| Jun 28, 2018 | Feb 26, 2024 | Jun 27, 2023 | Nov 12, 2008 | Update |
| 34 | 70 | 34 | 30 | Downloads |
| Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP, Other | Win11, Win10, Windows 7 x32, Windows 7 x64, Windows 8 | Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP, Other | Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows Vista x64, Windows Vista | OS |
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