
PDFTK Builder
PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use. It is a easy to use tool to collate (merge), split, encrypt, decrypt, stamp and rotate (only 90°, 180° or 270°) pdf documents.
iSafePDF is a free open source PDF protection software. It allows you to encrypt PDF document, sign them using a certificate and timestamp the signature. All those...
iSafePDF is a free open source PDF protection software.
It allows you to encrypt PDF document, sign them using a certificate and timestamp the signature.
All those features are PDF standards so your document will be readable/editable with all standard PDF programs.