Web Startup needs contemporary logo for Web Application

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This customer received 56 logo designs from 27 designers. They chose this logo design from CarolC as the winning design.
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Our company (DocRok) is looking to revolutionize the way that online documents are stored and managed. We need a contemporary logo that can be used across multiple devices (think display for iPad, iphone, and computers).
Themes to think about:
1) Organization, Management
2) Simplicity
3) Integrating, Connecting
4) Discoverability
DocRok = Document (an image, pdf, email, zip, etc) + Rok (rock) (A stable unchanging item, also alludes to rock as in "this rocks!")
What we pride ourselves on:
1) being secure
2) integrating into workflows without any hassle
3) SIMPLE
Updates
Flat Design is what we are looking for - perhaps take a queue from Microsoft Windows Metro design? Textures are fine in subtle amounts, monochrome is always nice. I want a logo that can survive through time and potential visual updates.
Added Saturday, July 13, 2013
Target Market(s)
Professional Home Users, Avid Email Users, Small/Medium size Businesses
Industry/Entity Type
It Company
Logo Text
D or DokRok or DR or no text at all, you decide
Logo styles of interest
Abstract Logo
Conceptual / symbolic (optional text)



Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- 1) Clean design, Lines should be well defined. use of any gradients should be very subtle
2) Professional feeling yet forward looking. something along the lines of Twitter, Box, DropBox, Facebook, etc...
3) Must be in a vector format (AI please)
4) Have fun with the logo, focus on negative space, use transparencies to create a logo that can live within the application
Should not have
- Please DO NOT give me a logo that includes a human figure, the focus is on what the application does (manage our users documents).