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News We Recently Launched SysTools Email Decryptor , SysTools Data Recovery Toolkit , SysTools Video Converter , SysTools Email Address Checker , SysTools MBOX Splitter , SysTools MBOX Merge , SysTools CSV Split & Merge , SysTools Excel Split & Merge | News SysTools Commitment to Child Safety: Upholding the Fight Against CSAM |

SysTools PDF Lock 4.0 Released – The Ultimate Upgrade in PDF Protection & Security

August 26, 2025 | Press Releae

New Delhi, India – August 26, 2025 — SysTools, a leader in data management and security solutions, today announced the launch of its updated SysTools PDF Lock 4.0. This powerful and feature-rich solution provides advanced protection and access control of PDFs. The newest version of PDF Locker includes several updates that provide professionals and organizations with the necessary capabilities to properly control document security on a larger scale with precision and flexibility. With the latest version, users can protect PDFs with all kinds of protection: password, encryption, and owner permissions.

Since PDF security continues to be a leading concern for businesses, legal professionals, researchers, publishers, and government agencies, as data breaches, unauthorized access or sharing of documents, and IP theft increase. With SysTools PDF Lock 4.0 version, these needs are addressed by providing better password protection and encryption, and permission controls that can lock PDF documents to prevent misuse of sensitive information. In other words, users can secure multiple PDFs from editing, copying, repurposing, and more in batch mode.

Enhanced Features of SysTools PDF Lock 4.0 Software for Windows OS

  • Batch PDF File Protection: Users can add multiple PDF files, including the Folder option. This smart feature significantly reduces time and effort for professionals needing to secure large PDF documents, streamlining bulk operations simultaneously.
  • Advanced Printing Restrictions: SysTools PDF Locker 4.0 offers more refined control over printing permissions, giving users flexibility in deciding how their content can be reproduced:
    • Not Allowed: Restricts all forms of printing.
    • Low Resolution (150 dpi): Allows limited, low-resolution printing.
    • High Resolution: Grants full high-resolution printing rights.
  • Enhanced Copy Restrictions: Protecting intellectual property and sensitive data often requires control over content copying. With the latest version of 4.0, users can ensure information security. The new edition introduces two options:
    • Enable Text Access from Screen Readers: Allows screen reader tools for accessibility without enabling full content copying.
    • Allow Copying of Text, Images, and Other Content: Permits complete content copying, including images and text, as needed.
  • Comprehensive Editing and Changes Permissions: SysTools PDF Lock 4.0 software gives users greater control over what modifications can be performed on locked PDFs. Options include:
    • Not Allowed: Completely restrict all kinds of editing.
    • Document Assembly (Insert, Delete, Rotate Pages): Allows page-level modifications while restricting other edits.
    • Fill in Forms and Sign Fields: Enables form completion and digital signatures while restricting other changes.
    • Commenting, Fill, and Sign Fields: Permits commenting alongside form filling and signing.
    • Except for Extracting Pages: Allows most edits but prevents page extraction for document integrity.
  • Document Open Password Support: In addition to permission restrictions, users can now apply Document Open Passwords, ensuring that only authorized individuals can even access the content of the PDF. In other words, you can create a strong password for your PDF document to ensure security.
  • Strong Encryption Standards: This PDF Locker 4.0 supports multiple encryption algorithms, allowing users to choose RC4-40, RC4-128, AES-128, and AES-256 encryption. With AES-256 being the industry’s most advanced standard, users are confirmed maximum security for their critical files.

    • "We believe that document security should not compromise usability," said Anuraag Singh, CEO of SysTools. "We're providing users with the tools to securely protect sensitive information with enhanced encryption, intuitive permission controls, and batch processing. In other words, professional can conqure data protection and privacy when need for sharing the PDF document. This release represents a big step toward aligning robust document security with usability."

    SysTools PDF Lock 4.0 demonstrates the company's commitment to developing smarter, stronger, and intuitive document security solutions. Whether you wish to restrict printing, content copying, editing, or applying strong encryption—PDF Lock 4.0 ensures the appropriate security elements for your sensitive files.

    Availability: SysTools PDF Lock 4.0 is available for download, try the demo version.

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    About SysTools

    SysTools is a global leader in data recovery, digital forensics, and security solutions. With years of experience, SysTools has enabled millions of users across the globe with simple solutions to complex IT problems. We have established exceptional benchmarks in innovation, reliability, and ease of use in enterprise solutions and personal data management.