"NEC-conference-35" was created by NEC Corporation of America and is licensed under CC BY 2.0

"Computer Security - Padlock" was created by perspec_photo88 and is licensed under CC BY-SA 2.0

"portatil-tablet-smartphone" was created by miniyo73 and is licensed under CC BY-SA 2.0

"Analyzing Stock Market" was created by ota_photos and is licensed under CC BY-SA 2.0

"Spring 2012 Student Hackathon Coding" was created by hackNY and is licensed under CC BY-SA 2.0

"Library Bookshelf" was created by Open Grid Scheduler / Grid Engine and is in the public domain per the original site.