All versionsSee all
A-PDF Password Security is a desktop utility program that lets you change password security of existing Acrobat PDF files. Protect your PDF documents from unauthorized access with standard password security:
- 40-bit RC4 encryption, which is supported by Adobe Acrobat 3.0 or above.
- 128-bit RC4 encryption, which is supported by Adobe Acrobat Reader 5.0 or above.
You can also remove the standard password security from protected PDF files. Supports 40/128 bit RC4 and 128 AES encryption.