These patents cover various linkage methods including:

Barcodes, RF/ID, Mag Stripe, Voice, and Other machine readable and keyed entry identifiers

The official NeoMedia patents can be viewed on the US Patent and Trademark Office Web site
by using the following links:

• Number
  Title
• 5,933,829
  Automatic access of electronic information through secure machine-readable codes on printed documents
• 5,978,773
  System and method for using an ordinary article of commerce to access a remote computer
• 6,108,656
  Automatic access of electronic information through machine-readable codes on printed documents
• 6,199,048
  System and method for automatic access of a remote computer over a network
• 6,430,554
  Interactive system for investigating products on a network
• 6,434,561
  Method and system for accessing electronic resources via machine-readable data on intelligent documents
• 6,542,933
  System and method of using machine-readable or human-readable linkage codes for accessing networked data resources
• 6,651,053
  Interactive system for investigating products on a network
• 6,675,165
  Method for linking a billboard or signage to information on a global computer network through manual information input or a global positioning system
• 6,766,363
  System and method of linking items in audio, visual, and printed media to related information stored on an electronic network using a mobile device
• 6,865,608
  Method and system for simplified access to internet content on a wireless device
• 6,993,573
  Automatic access of internet content with a camera-enabled cell phone