PanelTutorialCopyrightRelease2007.pdf: 
This copyright form is intended for short (maximum 2 page) documents typically used for panel, tutorial, or workshop descriptions. 

CopyRightRelease2007.pdf:  
This copyright form is intended for papers that are longer than 2 pages. All authors must sign the form. 

CopyRightReleaseSingleSign2007.pdf:  
This copyright form is intended for all documents where one author signs for all authors. The author signing must circle the statement indicating this agreement.