Hello Jackobians.. Are you looking for a way to sign PDF documents.. Then this post is for you. Digital signature is the alternative way of signing documents in era of electronic exchange of documents. One of the most prevalent types of these documents are PDF files. There are professional tools on the market that one can use, by spending certain amount of cash to achieve digitally signing of these PDF files. There are also limited number of software publicly available by creative commons in form of open and free software. Download PDF utility from Messiah's "codes for us" blogspot. Save the "jar" file somewhere in your computer. (No installation is necessary.) Double click the "jar" file to open the software. In the right hand panel, there is a button for signature manager. Click on it to bring the signature interface. Then brows for the document to be signed. There are fields to give the "Reason" for signing (e.g., being the author) and your own "Location" and the page number that should be signed. You should choose for the appearance of the signature (e.g., self signed or Windows Certificate Security). You should decide for visibility of the signature and if it is a new signature on the document or an added signature by checking the radio-buttons available. One should have "PKCS#12," that is, a PFX key-pair certification available in the directory or somewhere on his desktop; its "password" should be entered into the required field. At the same place there are resources that makes you enable to create this PFX file for self-signing. Having PFX, after entering password, click on the "Get PFX" button to go to its directory and grab it. You can decide where on the document put your digital signature, by entering its coordinates manually in the coordinates field or by clicking on the "Get Mouse" button to open a scaled replica of the page of your document.Take the cursor and create a rectangle as the place-holder for your digital signature. At the end click on the "Sign It!" button. Your signed file comes with a new name in the directory to keep your original file untouched. You can rename it to whatever name you like. I hope this helps. Thanks for reading.