Logo for new web service DocTracking.com

Our name (DocTracking) and/or a cleverly-related good-looking logo needs designing for our future web site.

DocTracking

Our tracking tells our customers when documents they have sent/given to other people get opened.

For example:-
- When someone sends a PDF invoice, DocTracking tells them the date and time the invoice was read (as well as what pages were read, how long for, where in the world the reader was, whether or not it was printed out, and all that info again if the PDF is forwarded to anyone else, etc).
If the invoice does not get paid - the sender knows the recipient is deliberately not paying (as opposed to them not having received/read the invoice).
- If a salesman sends a tracked MS-Word brochure, our service tells them instantly when it's opened - the perfect time for the salesman to place a followup phone call.
- If an engineer sends a confidential Excel spreadsheet to a customer, they will know immediately if that customer illegally forwards the confidential information to someone else (and to whom)
- If an advertiser sends a Powerpoint presentation to a group of people, DocTracking tells them how many people looked at it in total, with geographic charts and breakdowns etc.I need a logo for my company, probably to go alongside my company name (or to include my company name in the graphic).

I am open to anything that looks professional.  An example of something I like is the "blues" color scheme in the PayPal logo.

Must look professional - preferably also "clever"

Original high-definition/vector art format files required (eg: photoshop/illustrator/etc)

I don't want anything amateur or gawdy looking