PDFTron's PDF Secure SDK is an affordable, industrial strength licensable
component that can be used to add, remove, and change security settings on
PDF documents or whole directories of documents.
Because of built-in support for multi-threading, PDF Secure SDK provides a
reliable building block for third-party client and server-based
Using PDF Secure SDK, standard PDF bit encryption (40 and 128 bit) can be
applied to any existing PDF document or to whole directories of documents.
Security settings (e.g. changing passwords and security permissions) can
easily be modified and all standard options and permissions can be
specified directly through an easy-toľuse API. The library supports PDF
1.5 and Acrobat 6 documents, and is available for VB6, various C/C++
compilers, C#, VB.Net, and other .Net languages.
Key Functions of PDF Secure:
Apply standard PDF 40 and 128 bit encryption to any existing PDF
document or whole directories of documents
Modify security settings (e.g. change passwords and security
Supports PDF 1.5 and Acrobat 6 documents
All standard options and permissions can be specified:
Set or modify user and owner
'Print' and 'high resolution print' permission
Modify document's contents
Copy or extract text and graphics
Add or modify text annotations; fill in interactive form fields
Set, create or modify interactive form fields
Fill in existing interactive form fields
Extract text and graphics (in support of accessibility to disabled
users or for other purposes)
Assemble the document (insert, rotate, or delete pages and create
bookmarks or thumbnail images)
Automatically add or edit document information data such as Author,
Subject, Title or Keywords to all processed documents.
Custom security handlers can be added through an extension mechanism.
If you are not satisfied with standard PDF security, a custom security
handler can be quickly developed through an easy to use API
Because of built-in support for multi-threading, PDF Secure is a good
match for server-based applications.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.