| PDF Page Lock | Program Protector | PDF Unshare | PenProtect | |
| 2.0.4 | 4.15 | 1.5.3 | 1.45 | |
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| Freeware | Demo | Freeware | Demo | Licence |
| FREE | $14.97 | FREE | $19.00 | Price |
| 11.33 MB | 2.40 MB | 19.82 MB | 1.81 MB | File size |
| Jun 28, 2018 | Nov 28, 2025 | Jun 27, 2023 | Nov 12, 2008 | Update |
| 92 | 93 | 99 | 67 | Downloads |
| Win2000, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows Vista x64, Windows XP, Other | Windows 11, Windows 10 32/64 bit, Windows 8 32/64 bit, Windows 7 32/64 bit | 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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