Many commercial software programs are available in the market that can be used to edit PDF documents. Most of these programs allow you to annotate the pdf files. You can also edit the objects in the pdf files too. Some of the software available will only edit the annotations. So while purchasing software for editing the pdf files, you have to look for the features that are available in it before making the decision to buy it. The pdf editors should allow you to edit the objects like images in the pdf document, replace the text if necessary, and should allow you to move the content to any location in the document. With good software for editing pdf documents you can do all these. You should also be able to resize the documents. Every pdf document will have metadata like author, keyword, and other security options. All these metadata also should be editable in the pdf editor. So you can use a good PDF Editor to edit the pdf files.
[tags]File Format, Editor[/tags]