Proview is a PDF Editor for Mac OS X. It allows you to merge and split files, rotate flip and scale individual pages, or all pages, crop pages and modify the document information
It can edit encrypted files, and can decrypt and encrypt PDF documents.
You can also manage PDF bookmarks, add or remove PDF attachments, and add text and dates to one or more pages.
Proview has a simple, clean interface with all functions easily accessible, and comes with full interactive help.